build(deps-dev): bump typescript from 3.8.3 to 3.9.6 (#51)

Bumps [typescript](https://github.com/Microsoft/TypeScript) from 3.8.3 to 3.9.6.
- [Release notes](https://github.com/Microsoft/TypeScript/releases)
- [Commits](https://github.com/Microsoft/TypeScript/compare/v3.8.3...v3.9.6)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package.json

@@ -47,6 +47,6 @@
     "eslint-plugin-prettier": "^3.1.4",
     "eslint-plugin-simple-import-sort": "^5.0.2",
     "prettier": "^1.19.1",
-    "typescript": "^3.8.3"
+    "typescript": "^3.9.6"
   }
 }