Update TypeScript

package.json

@@ -63,7 +63,7 @@
     "rollup-plugin-terser": "^5.0.0",
     "rollup-plugin-typescript": "^1.0.1",
     "ts-node": "^8.2.0",
-    "typescript": "^3.3.3",
+    "typescript": "^3.5.1",
     "webpack": "^4.32.2"
   },
   "engines": {