Bump @types/mocha from 5.2.7 to 7.0.1

Bumps [@types/mocha](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/mocha) from 5.2.7 to 7.0.1.
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/mocha)

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

package.json

@@ -58,7 +58,7 @@
     "prepublish": "rc-tools run guard"
   },
   "devDependencies": {
-    "@types/mocha": "~5.2.7",
+    "@types/mocha": "~7.0.1",
     "@types/react": "^16.0.19",
     "@types/react-dom": "^16.0.2",
     "async": "^0.9.0",