Merge pull request #281 from halfzebra/upgrade-elm-test

fix(package.json): Upgrade elm-test to fix errors on Node v10

Author: halfzebra

.travis.yml

@@ -15,7 +15,7 @@ before_install:
   - export DISPLAY=':99.0'
   - Xvfb :99 -screen 0 1024x768x24 > /dev/null 2>&1 &
 install:
-  - yarn install
+  - npm install
   - npm link
 script: npm test
 after_success:

package.json

@@ -35,7 +35,7 @@
     "dotenv": "^5.0.0",
     "elm": "0.19.0-bugfix2",
     "elm-hot-webpack-loader": "^1.0.0",
-    "elm-test": "^0.19.0-beta4",
+    "elm-test": "^0.19.0-beta6",
     "elm-webpack-loader": "^5.0.0",
     "file-loader": "^1.1.6",
     "fs-extra": "^6.0.1",