chore(package): update coveralls to version 3.0.8

Closes #55

Author: greenkeeper[bot]

package.json

@@ -19,7 +19,7 @@
     "once": "1.4.0"
   },
   "devDependencies": {
-    "coveralls": "^2.11.6",
+    "coveralls": "^3.0.8",
     "eslint": "^4.4.1",
     "eslint-config-airbnb-base": "^11.0.1",
     "eslint-plugin-import": "^2.2.0",