build(deps-dev): 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

@@ -42,7 +42,7 @@
   "devDependencies": {
     "chai": "^4.2.0",
     "chai-as-promised": "^7.1.1",
-    "coveralls": "^3.0.5",
+    "coveralls": "^3.0.6",
     "elint": "^2.0.0-alpha.1",
     "elint-preset-kw": "^1.8.1",
     "joi": "^14.3.1",