Bump coveralls from 3.0.5 to 3.0.6

Bumps [coveralls](https://github.com/nickmerwin/node-coveralls) from 3.0.5 to 3.0.6.
- [Release notes](https://github.com/nickmerwin/node-coveralls/releases)
- [Commits](https://github.com/nickmerwin/node-coveralls/commits)

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

package.json

@@ -39,7 +39,7 @@
     "winston-papertrail": "^1.0.5"
   },
   "devDependencies": {
-    "coveralls": "^3.0.5",
+    "coveralls": "^3.0.6",
     "del": "^5.0.0",
     "istanbul": "^1.1.0-alpha.1",
     "jest": "^24.8.0",