Fixed #20, update babel presets

Author: Ivan Demidov

package.json

@@ -27,9 +27,28 @@
   },
   "homepage": "https://github.com/GitScrum/postcss-attribute-selector-prefix#readme",
   "babel": {
-    "presets": [
-      "node5"
-    ],
+    "env": {
+      "node4": {
+        "presets": [
+          "es2015-node4"
+        ]
+      },
+      "node5": {
+        "presets": [
+          "es2015-node5"
+        ]
+      },
+      "node6": {
+        "presets": [
+          "es2015-node6"
+        ]
+      },
+      "development": {
+        "presets": [
+          "es2015"
+        ]
+      }
+    },
     "plugins": [
       "add-module-exports"
     ]
@@ -58,7 +77,10 @@
     "ava": "^0.14.0",
     "babel-cli": "^6.7.7",
     "babel-plugin-add-module-exports": "^0.1.4",
-    "babel-preset-node5": "^11.0.2",
+    "babel-preset-es2015": "^6.6.0",
+    "babel-preset-es2015-node4": "^2.1.0",
+    "babel-preset-es2015-node5": "^1.2.0",
+    "babel-preset-es2015-node6": "^0.1.3",
     "babel-register": "^6.7.2",
     "coveralls": "^2.11.9",
     "eslint": "^2.8.0",