fix: upgrade tslib from 1.10.0 to 1.11.1

Snyk has created this PR to upgrade tslib from 1.10.0 to 1.11.1.

See this package in NPM:
https://www.npmjs.com/package/tslib

See this project in Snyk:
https://app.snyk.io/org/snyk/project/b4fa2204-1d26-44ea-8128-960f24a90d79?utm_source=github&utm_medium=upgrade-pr

Author: snyk-bot

package.json

@@ -29,7 +29,7 @@
     "@types/node": "8.10.59",
     "eslint": "6.8.0",
     "event-loop-spinner": "1.1.0",
-    "tslib": "1.10.0",
+    "tslib": "1.11.1",
     "typescript": "3.8.3"
   },
   "devDependencies": {