Bump mocha from 6.2.2 to 7.0.0 (#69)

Bumps [mocha](https://github.com/mochajs/mocha) from 6.2.2 to 7.0.0.
- [Release notes](https://github.com/mochajs/mocha/releases)
- [Changelog](https://github.com/mochajs/mocha/blob/master/CHANGELOG.md)
- [Commits](mochajs/mocha@v6.2.2...v7.0.0)

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

package.json

@@ -27,7 +27,7 @@
   "devDependencies": {
     "benchmark": "^2.1.4",
     "chai": "^4.1.0",
-    "mocha": "^6.2.0",
+    "mocha": "^7.0.0",
     "nyc": "^15.0.0"
   }
 }