Use preset env

Author: SimenB

.babelrc

@@ -1,6 +1,17 @@
 {
   "presets": [
-    "es2015-node4"
+    ["env", {
+      "targets": {
+        "node": 4
+      },
+      "exclude": [
+        "transform-regenerator",
+        // These are not _really_ needed for node@4
+        "transform-es2015-classes",
+        "transform-es2015-block-scoping",
+        "transform-es2015-arrow-functions"
+      ]
+    }]
   ],
   "plugins": [
     ["transform-async-to-module-method", {

package.json

@@ -43,7 +43,7 @@
     "babel-cli": "^6.18.0",
     "babel-plugin-add-module-exports": "^0.2.1",
     "babel-plugin-transform-async-to-module-method": "^6.16.0",
-    "babel-preset-es2015-node4": "^2.1.0",
+    "babel-preset-env": "^1.4.0",
     "classnames": "^2.2.5",
     "del-cli": "^0.2.0",
     "eslint": "^3.19.0",