Bump mocha from 6.1.4 to 7.1.2

Bumps [mocha](https://github.com/mochajs/mocha) from 6.1.4 to 7.1.2.
- [Release notes](https://github.com/mochajs/mocha/releases)
- [Changelog](https://github.com/mochajs/mocha/blob/master/CHANGELOG.md)
- [Commits](mochajs/mocha@v6.1.4...v7.1.2)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Author: dependabot-preview[bot]

package.json

@@ -33,7 +33,7 @@
   },
   "devDependencies": {
     "eslint-config-standard": "^11.0.0",
-    "mocha": "^6.1.4",
+    "mocha": "^7.1.2",
     "np": "^5.0.1",
     "pre-commit": "^1.1.3",
     "standard": "^11.0.0",