Bump coveralls from 3.0.7 to 3.0.8

Bumps [coveralls](https://github.com/nickmerwin/node-coveralls) from 3.0.7 to 3.0.8.
- [Release notes](https://github.com/nickmerwin/node-coveralls/releases)
- [Commits](https://github.com/nickmerwin/node-coveralls/commits/3.0.8)

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

package.json

@@ -44,7 +44,7 @@
     "watchify": "^3.11.1"
   },
   "devDependencies": {
-    "coveralls": "^3.0.7",
+    "coveralls": "^3.0.8",
     "xo": "^0.25.3",
     "istanbul": "^1.1.0-alpha.1",
     "mocha": "^6.2.2"