➕ (build) adds core-js in attempt to resolve IE11 issue

Author: davejtoews

.babelrc

@@ -1,7 +1,11 @@
 {
     "presets": [
         [
-            "@babel/preset-env"
+            "@babel/preset-env",
+            {
+                "useBuiltIns": "usage",
+                "corejs": "3.6"
+            }
         ]
     ]
 }