modify /etc/hosts on Travis

.travis.yml

@@ -8,6 +8,10 @@ services:
   - docker
 
 addons:
+  # required for internal Aquarius-Brizo communication
+  # https://docs.travis-ci.com/user/hosts/
+  hosts:
+    - aquarius
   apt:
     packages:
       # for Cypress
@@ -17,7 +21,7 @@ env:
   global:
     # run E2E tests against local Spree
     - REACT_APP_NODE_URI="http://localhost:8545"
-    - REACT_APP_AQUARIUS_URI="http://localhost:5000"
+    - REACT_APP_AQUARIUS_URI="http://aquarius:5000"
     - REACT_APP_BRIZO_URI="http://localhost:8030"
     - REACT_APP_SECRET_STORE_URI="http://localhost:12001"
     - REACT_APP_FAUCET_URI="http://localhost:3001"