chore(deps): update dependency core-js to v2.6.11 (#500)

Author: renovate[bot]

package-lock.json

@@ -50,7 +50,7 @@
     "babel-preset-env": "1.7.0",
     "clean-webpack-plugin": "3.0.0",
     "copy-webpack-plugin": "5.0.5",
-    "core-js": "2.6.10",
+    "core-js": "2.6.11",
     "cross-env": "6.0.3",
     "css-loader": "3.2.1",
     "eslint": "6.7.2",