Upgrade dependency coveralls to ^3.0.0 (#310)

Author: doppins-bot

package.json

@@ -54,7 +54,7 @@
     "babel-preset-node6": "^11.0.0",
     "babel-preset-stage-0": "^6.5.0",
     "chai": "^4.0.2",
-    "coveralls": "^2.11.14",
+    "coveralls": "^3.0.0",
     "eslint": "^4.1.1",
     "eslint-config-airbnb-base": "^11.0.1",
     "eslint-plugin-import": "^2.2.0",