Add support for async/await

.babelrc

@@ -1 +1,4 @@
-{ "presets": ["es2015"] }
+{
+  "presets": ["es2015"],
+  "plugins": ["transform-runtime"]
+}

.eslintrc

@@ -1,7 +1,7 @@
 {
   "parserOptions": {
     "sourceType": "module",
-    "ecmaVersion": 6,
+    "ecmaVersion": 2017,
     "ecmaFeatures": {
       "experimentalObjectRestSpread": true,
       "impliedStrict": true,

package.json

@@ -34,7 +34,8 @@
         "babelify",
         {
           "presets": [
-            "es2015"
+            "es2015",
+            "stage-3"
           ]
         }
       ],
@@ -45,6 +46,7 @@
   "dependencies": {
     "async": "^1.5.2",
     "async-q": "^0.3.1",
+    "babel-runtime": "^6.23.0",
     "bip39": "^2.2.0",
     "bluebird": "^3.5.0",
     "browser-passworder": "^2.0.3",
@@ -125,6 +127,8 @@
   },
   "devDependencies": {
     "babel-eslint": "^6.0.5",
+    "babel-plugin-transform-runtime": "^6.23.0",
+    "babel-preset-stage-3": "^6.24.1",
     "babel-register": "^6.7.2",
     "babelify": "^7.2.0",
     "beefy": "^2.1.5",