chore(deps): update dependency typescript to v4 (#97)

Co-authored-by: Renovate Bot <[email protected]>

Author: renovate[bot]

package.json

@@ -51,7 +51,7 @@
     "rollup": "^2.26.10",
     "standardx": "^5.0.0",
     "ts-transform-default-export": "^1.0.2",
-    "typescript": "^3.9.7"
+    "typescript": "^4.0.0"
   },
   "files": [
     "build",