chore(deps): update dependency typescript to ~3.5.0 (#121)

Author: renovate[bot]

handwritten/nodejs-promisify/package.json

@@ -42,7 +42,7 @@
     "nyc": "^14.0.0",
     "sinon": "^7.0.0",
     "source-map-support": "^0.5.6",
-    "typescript": "~3.4.0"
+    "typescript": "~3.5.0"
   },
   "engines": {
     "node": ">=8.10.0"