chore(package): update babel-preset-es2015 to version 6.24.1

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -41,7 +41,7 @@
     "@bryanrsmith/eslint-config-standard": "^2.1.3",
     "babel-cli": "^6.9.0",
     "babel-eslint": "^6.0.4",
-    "babel-preset-es2015": "^6.9.0",
+    "babel-preset-es2015": "^6.24.1",
     "babel-preset-stage-1": "^6.5.0",
     "coveralls": "^2.11.9",
     "eslint": "^2.13.0",