Bump typescript from 3.9.7 to 4.0.2

Bumps [typescript](https://github.com/Microsoft/TypeScript) from 3.9.7 to 4.0.2.
- [Release notes](https://github.com/Microsoft/TypeScript/releases)
- [Commits](microsoft/TypeScript@v3.9.7...v4.0.2)

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

package.json

@@ -74,7 +74,7 @@
     "nyc": "13.3.0",
     "prettier": "^2.0.5",
     "sinon": "9.0.2",
-    "typescript": "^3.9.5"
+    "typescript": "^4.0.2"
   },
   "dependencies": {
     "commander": "2.20.0",