Fixed #70, change babel preset

Author: Ivan Demidov

package.json

@@ -43,22 +43,22 @@
     "babel-cli": "^6.6.5",
     "babel-eslint": "^6.0.4",
     "babel-plugin-add-module-exports": "^0.2.0",
-    "babel-preset-es2015-node6": "^0.2.0",
+    "babel-preset-es2015-node": "^6.1.0",
     "babel-register": "^6.7.2",
     "coveralls": "^2.11.9",
-    "nyc": "^6.2.1",
-    "updtr": "^0.1.10",
     "eslint": "^2.10.2",
     "eslint-config-xo": "^0.14.1",
     "eslint-formatter-pretty": "^0.2.2",
     "eslint-plugin-ava": "^2.3.1",
     "eslint-plugin-babel": "^3.2.0",
     "eslint-plugin-require-path-exists": "^1.1.5",
-    "eslint-plugin-xo": "^0.4.3"
+    "eslint-plugin-xo": "^0.4.3",
+    "nyc": "^6.2.1",
+    "updtr": "^0.1.10"
   },
   "babel": {
     "presets": [
-      "es2015-node6"
+      "es2015-node"
     ],
     "plugins": [
       "add-module-exports"