chore(package): update coveralls to version 3.0.0

Author: greenkeeper[bot]

package.json

@@ -29,7 +29,7 @@
   "devDependencies": {
     "ava": "^0.20.0",
     "bel": "^4.5.0",
-    "coveralls": "^2.11.15",
+    "coveralls": "^3.0.0",
     "cross-env": "^5.0.0",
     "nyc": "^11.0.1",
     "regenerate": "^1.3.2",