chore(package): update tslib to version 2.0.0

Closes #56

Author: greenkeeper[bot]

package.json

@@ -37,7 +37,7 @@
     "sass-loader": "7.1.0",
     "style-loader": "0.23.1",
     "ts-loader": "^6.0.1",
-    "tslib": "1.9.3",
+    "tslib": "2.0.0",
     "tslint": "5.16.0",
     "typescript": "^3.4.5",
     "uglifyjs-webpack-plugin": "^2.1.3",