Bump coveralls from 3.0.6 to 3.1.0

Bumps [coveralls](https://github.com/nickmerwin/node-coveralls) from 3.0.6 to 3.1.0.
- [Release notes](https://github.com/nickmerwin/node-coveralls/releases)
- [Commits](nickmerwin/node-coveralls@v3.0.6...v3.1.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

package.json

@@ -41,7 +41,7 @@
   },
   "devDependencies": {
     "ava": "^0.25.0",
-    "coveralls": "3.0.6",
+    "coveralls": "3.1.0",
     "eslint": "^4.10",
     "eslint-config-airbnb-base": "13.2.0",
     "eslint-plugin-import": "2.18.2",