remove babel-preset-env

.babelrc

@@ -1,23 +1,7 @@
 {
   "presets": [
-    ["env", {
-      "modules": false,
-      "targets": {
-        "browsers": [
-          "last 2 Chrome versions",
-          "last 2 Opera versions",
-          "last 2 Firefox versions",
-          "last 2 Edge versions",
-          "last 2 Safari versions",
-          "last 2 iOS versions",
-          "last 2 ChromeAndroid versions"
-        ]
-      }
-    }],
     "react",
-    /**
-     * Support WebPack version 1.
-     */
+    "es2015",
     "es2016",
     "es2017",
   ],
@@ -31,19 +15,10 @@
       "useESModules": true
     }],
     ["module-resolver", {
-      /**
-       * Use aliases to avoid relative path import hell.
-       */
       "root": [
-        /**
-         * Components
-         */
         "./src/components"
       ],
       "alias": {
-        /**
-         * Top level src directories
-         */
         "Actions": "./src/actions/",
         "Backends": "./src/backends/",
         "Constants": "./src/constants/",
@@ -58,17 +33,6 @@
     }],
     "transform-export-extensions",
     "transform-class-properties",
-    "transform-object-rest-spread",
-  ],
-  "env": {
-    "test": {
-      "presets": [
-        ["env", {
-          "targets": {
-            "node": "6"
-          }
-        }]
-      ]
-    }
-  }
+    "transform-object-rest-spread"
+  ]
 }