diff --git a/package-lock.json b/package-lock.json
index 83c47b0..d685926 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -261,14 +261,12 @@
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-      "dev": true
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+      "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c=",
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@@ -1412,7 +1413,6 @@
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@@ -1435,20 +1434,17 @@
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-          "dev": true
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@@ -1641,8 +1637,7 @@
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-      "dev": true
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@@ -1745,7 +1740,6 @@
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@@ -1829,7 +1823,8 @@
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-      "integrity": "sha1-2Klr13/Wjfd5OnMDajug1UBdR3s="
+      "integrity": "sha1-2Klr13/Wjfd5OnMDajug1UBdR3s=",
+      "dev": true
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@@ -2290,8 +2285,7 @@
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-      "dev": true
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@@ -3109,9 +3103,9 @@
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+      "version": "4.0.0-beta.3",
+      "resolved": "https://registry.npmjs.org/ethers/-/ethers-4.0.0-beta.3.tgz",
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@@ -3126,9 +3120,9 @@
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+          "version": "10.14.13",
+          "resolved": "https://registry.npmjs.org/@types/node/-/node-10.14.13.tgz",
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@@ -3184,9 +3178,9 @@
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-      "integrity": "sha1-R3hr2qCHyvext15zq8XH1UAVjNA="
+      "version": "3.1.2",
+      "resolved": "https://registry.npmjs.org/eventemitter3/-/eventemitter3-3.1.2.tgz",
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@@ -3739,12 +3733,21 @@
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-      "integrity": "sha1-BGxwFjzvmq1GsOSn+kZ/si1x3jU=",
+      "version": "4.0.3",
+      "resolved": "https://registry.npmjs.org/fs-extra/-/fs-extra-4.0.3.tgz",
+      "integrity": "sha512-q6rbdDd1o2mAnQreO7YADIxf/Whx4AHBiRf6d+/cVT8h44ss+lHgxf1FemcqDnQt9X3ct4McHr+JMGlYSsK7Cg==",
       "requires": {
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-        "jsonfile": "^2.1.0"
+        "jsonfile": "^4.0.0",
+        "universalify": "^0.1.0"
+      }
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+    "fs-minipass": {
+      "version": "1.2.6",
+      "resolved": "https://registry.npmjs.org/fs-minipass/-/fs-minipass-1.2.6.tgz",
+      "integrity": "sha512-crhvyXcMejjv3Z5d2Fa9sf5xLYVCF5O1c71QxbVnbLsmYMBEvDAftewesN/HhY03YRoA7zOMxjNGrF5svGaaeQ==",
+      "requires": {
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@@ -3761,11 +3764,33 @@
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       "integrity": "sha1-9k5PhUvPaJqovdy6JokW2z20aFQ=",
+      "dev": true,
       "requires": {
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         "fs-extra": "^2.0.0",
         "mz": "^2.6.0",
         "thenify-all": "^1.6.0"
+      },
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+          "resolved": "https://registry.npmjs.org/fs-extra/-/fs-extra-2.1.2.tgz",
+          "integrity": "sha1-BGxwFjzvmq1GsOSn+kZ/si1x3jU=",
+          "dev": true,
+          "requires": {
+            "graceful-fs": "^4.1.2",
+            "jsonfile": "^2.1.0"
+          }
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+        "jsonfile": {
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+          "resolved": "https://registry.npmjs.org/jsonfile/-/jsonfile-2.4.0.tgz",
+          "integrity": "sha1-NzaitCi4e72gzIO1P6PWM6NcKug=",
+          "dev": true,
+          "requires": {
+            "graceful-fs": "^4.1.6"
+          }
+        }
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@@ -3783,7 +3808,8 @@
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-      "integrity": "sha1-FQStJSMVjKpA20onh8sBQRmU6k8="
+      "integrity": "sha1-FQStJSMVjKpA20onh8sBQRmU6k8=",
+      "dev": true
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@@ -3805,7 +3831,8 @@
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-          "dev": true
+          "dev": true,
+          "optional": true
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@@ -3826,12 +3853,14 @@
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-          "dev": true
+          "dev": true,
+          "optional": true
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           "version": "1.1.11",
           "bundled": true,
           "dev": true,
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@@ -3846,17 +3875,20 @@
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           "version": "1.1.0",
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-          "dev": true
+          "dev": true,
+          "optional": true
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           "version": "0.0.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
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           "version": "1.1.0",
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@@ -3973,7 +4005,8 @@
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           "bundled": true,
-          "dev": true
+          "dev": true,
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@@ -3985,6 +4018,7 @@
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           "dev": true,
+          "optional": true,
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@@ -3999,6 +4033,7 @@
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           "dev": true,
+          "optional": true,
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@@ -4006,12 +4041,14 @@
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           "version": "0.0.8",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
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           "version": "2.3.5",
           "bundled": true,
           "dev": true,
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@@ -4030,6 +4067,7 @@
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@@ -4110,7 +4148,8 @@
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-          "dev": true
+          "dev": true,
+          "optional": true
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@@ -4122,6 +4161,7 @@
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           "bundled": true,
           "dev": true,
+          "optional": true,
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@@ -4207,7 +4247,8 @@
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-          "dev": true
+          "dev": true,
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@@ -4243,6 +4284,7 @@
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@@ -4262,6 +4304,7 @@
           "version": "3.0.1",
           "bundled": true,
           "dev": true,
+          "optional": true,
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@@ -4305,12 +4348,14 @@
         "wrappy": {
           "version": "1.0.2",
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-          "dev": true
+          "dev": true,
+          "optional": true
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           "version": "3.0.3",
           "bundled": true,
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+          "dev": true,
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+      "dev": true,
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@@ -4396,6 +4442,7 @@
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+      "dev": true,
       "requires": {
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         "inflight": "^1.0.4",
@@ -4512,24 +4559,53 @@
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+      "version": "9.6.0",
+      "resolved": "https://registry.npmjs.org/got/-/got-9.6.0.tgz",
+      "integrity": "sha512-R7eWptXuGYxwijs0eV+v3o6+XH1IqVK8dJOEecQfTmkncw9AV4dcw/Dhxi8MdlqPthxxpZyizMzyg8RTmEsG+Q==",
       "requires": {
-        "decompress-response": "^3.2.0",
+        "@sindresorhus/is": "^0.14.0",
+        "@szmarczak/http-timer": "^1.1.2",
+        "cacheable-request": "^6.0.0",
+        "decompress-response": "^3.3.0",
         "duplexer3": "^0.1.4",
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-        "is-plain-obj": "^1.1.0",
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-        "is-stream": "^1.0.0",
-        "isurl": "^1.0.0-alpha5",
-        "lowercase-keys": "^1.0.0",
-        "p-cancelable": "^0.3.0",
-        "p-timeout": "^1.1.1",
-        "safe-buffer": "^5.0.1",
-        "timed-out": "^4.0.0",
-        "url-parse-lax": "^1.0.0",
-        "url-to-options": "^1.0.1"
+        "get-stream": "^4.1.0",
+        "lowercase-keys": "^1.0.1",
+        "mimic-response": "^1.0.1",
+        "p-cancelable": "^1.0.0",
+        "to-readable-stream": "^1.0.0",
+        "url-parse-lax": "^3.0.0"
+      },
+      "dependencies": {
+        "get-stream": {
+          "version": "4.1.0",
+          "resolved": "https://registry.npmjs.org/get-stream/-/get-stream-4.1.0.tgz",
+          "integrity": "sha512-GMat4EJ5161kIy2HevLlr4luNjBgvmj413KaQA7jt4V8B4RDsfpHk7WQ9GVqfYyyx8OS/L66Kox+rJRNklLK7w==",
+          "requires": {
+            "pump": "^3.0.0"
+          }
+        },
+        "prepend-http": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/prepend-http/-/prepend-http-2.0.0.tgz",
+          "integrity": "sha1-6SQ0v6XqjBn0HN/UAddBo8gZ2Jc="
+        },
+        "pump": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/pump/-/pump-3.0.0.tgz",
+          "integrity": "sha512-LwZy+p3SFs1Pytd/jYct4wpv49HiYCqd9Rlc5ZVdk0V+8Yzv6jR5Blk3TRmPL1ft69TxP0IMZGJ+WPFU2BFhww==",
+          "requires": {
+            "end-of-stream": "^1.1.0",
+            "once": "^1.3.1"
+          }
+        },
+        "url-parse-lax": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/url-parse-lax/-/url-parse-lax-3.0.0.tgz",
+          "integrity": "sha1-FrXK/Afb42dsGxmZF3gj1lA6yww=",
+          "requires": {
+            "prepend-http": "^2.0.0"
+          }
+        }
       }
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@@ -4719,8 +4795,7 @@
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@@ -9885,16 +10532,6 @@
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