Bump @types/mocha from 2.2.48 to 8.0.0

Bumps [@types/mocha](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/mocha) from 2.2.48 to 8.0.0.
- [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

@@ -64,7 +64,7 @@
   "homepage": "https://github.com/dolanmiu/docx#readme",
   "devDependencies": {
     "@types/chai": "^3.4.35",
-    "@types/mocha": "^2.2.39",
+    "@types/mocha": "^8.0.0",
     "@types/request-promise": "^4.1.42",
     "@types/shortid": "0.0.29",
     "@types/sinon": "^4.3.1",