Bump typescript from 3.9.7 to 4.0.3 (#82)

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)

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

Author: dependabot-preview[bot]

package.json

@@ -57,6 +57,6 @@
     "eslint": "^7.1.0",
     "father": "^2.13.2",
     "np": "^5.0.3",
-    "typescript": "^3.5.2"
+    "typescript": "^4.0.3"
   }
 }