chore(deps): update dependency typescript to v3.8.3

Author: renovate-bot

package-lock.json

@@ -141,7 +141,7 @@
     "tslint-config-prettier": "1.18.0",
     "tslint-config-standard": "8.0.1",
     "typedoc": "0.15.0",
-    "typescript": "3.5.3"
+    "typescript": "3.8.3"
   },
   "dependencies": {
     "commander": "2.20.0",