Add polyfill

.babelrc

@@ -1,6 +1,11 @@
 {
     "presets": [
-        "@babel/preset-env",
+        [
+            "@babel/preset-env",
+            {
+                "useBuiltIns": "entry"
+            }
+        ],
         "@babel/preset-react"
     ],
     "plugins": [

package.json

@@ -106,6 +106,7 @@
         "webpack-pwa-manifest": "^3.6.2"
     },
     "dependencies": {
+        "@babel/polyfill": "^7.2.5",
         "@togglecorp/ravl": "^1.2.0",
         "@togglecorp/react-rest-request": "^1.3.1",
         "body-parser": "^1.18.3",

yarn.lock

@@ -754,6 +754,14 @@
     core-js "^2.5.7"
     regenerator-runtime "^0.12.0"
 
+"@babel/polyfill@^7.2.5":
+  version "7.2.5"
+  resolved "https://registry.yarnpkg.com/@babel/polyfill/-/polyfill-7.2.5.tgz#6c54b964f71ad27edddc567d065e57e87ed7fa7d"
+  integrity sha512-8Y/t3MWThtMLYr0YNC/Q76tqN1w30+b0uQMeFUYauG2UGTR19zyUtFrAzT23zNtBxPp+LbE5E/nwV/q/r3y6ug==
+  dependencies:
+    core-js "^2.5.7"
+    regenerator-runtime "^0.12.0"
+
 "@babel/[email protected]":
   version "7.0.0-beta.54"
   resolved "https://registry.yarnpkg.com/@babel/preset-env/-/preset-env-7.0.0-beta.54.tgz#4b05c4e3aaed64a509098e4e854dfc0e02edf053"