Update coveralls requirement from 3.0.5 to 3.0.6

Updates the requirements on [coveralls](https://github.com/nickmerwin/node-coveralls) to permit the latest version.
- [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

@@ -25,7 +25,7 @@
   },
   "devDependencies": {
     "axios-mock-adapter": "1.17.0",
-    "coveralls": "3.0.5",
+    "coveralls": "3.0.6",
     "doxdox": "3.0.0",
     "fs": "0.0.1-security",
     "jest": "24.8.0",