Update dependency tslib to v1.11.2

Author: renovate-bot

package-lock.json

@@ -99,7 +99,7 @@
     "protractor": "5.4.2",
     "ts-node": "8.1.0",
     "tsickle": "0.38.0",
-    "tslib": "1.10.0",
+    "tslib": "1.11.2",
     "tslint": "5.20.1",
     "typescript": "3.5.3"
   },