Update dependency tslib to v1.11.1

Author: renovate-bot

package-lock.json

@@ -13,7 +13,7 @@
     "@types/node": "^10.3.0",
     "form-data": "3.0.0",
     "isomorphic-fetch": "2.2.1",
-    "tslib": "1.11.0",
+    "tslib": "1.11.1",
     "workfront-api-constants": "2.0.0"
   },
   "devDependencies": {