chore(package): update coveralls to version 3.0.1

Closes #101

Author: greenkeeper[bot]

package.json

@@ -18,7 +18,7 @@
   },
   "devDependencies": {
     "ava": "^0.20.0",
-    "coveralls": "^2.13.1",
+    "coveralls": "^3.0.1",
     "dotenv": "^4.0.0",
     "nyc": "^11.0.3",
     "rimraf": "^2.6.1",