Bump typescript from 3.9.7 to 4.0.3 (#225)

Bumps [typescript](https://github.com/Microsoft/TypeScript) from 3.9.7 to 4.0.3.
- [Release notes](https://github.com/Microsoft/TypeScript/releases)
- [Commits](microsoft/TypeScript@v3.9.7...v4.0.3)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Author: dependabot-preview[bot]

package.json

@@ -55,7 +55,7 @@
     "np": "^6.0.0",
     "react": "^16.10.2",
     "react-dom": "^16.10.2",
-    "typescript": "^3.6.4"
+    "typescript": "^4.0.3"
   },
   "maintainers": [
     "yiminghe@gmail.com"