Upgrade to babel-preset-env

Author: jakezatecky

.babelrc

@@ -1,3 +1,11 @@
 {
-  "presets": ["react", "es2015", "stage-2"]
+  "presets": [
+    "react",
+    ["env", {
+      "targets": {
+        "browsers": ["last 2 versions"]
+      }
+    }],
+    "stage-2"
+  ]
 }

package.json

@@ -30,7 +30,6 @@
     "babel-core": "^6.13.2",
     "babel-eslint": "^8.0.0",
     "babel-loader": "^7.0.0",
-    "babel-preset-es2015": "^6.13.2",
     "babel-preset-react": "^6.11.1",
     "babel-preset-stage-2": "^6.5.0",
     "browser-sync": "^2.18.6",
@@ -59,6 +58,7 @@
     "webpack-stream": "^4.0.0"
   },
   "dependencies": {
+    "babel-preset-env": "^1.6.0",
     "classnames": "^2.2.5",
     "lodash": "^4.17.4",
     "prop-types": "^15.5.8",