chore(package): update babel-preset-es2015 to version 6.24.0

https://greenkeeper.io/

Author: greenkeeper[bot]

package.json

@@ -44,7 +44,7 @@
     "@types/react": "15.0.16",
     "ava": "0.18.2",
     "babel-core": "6.23.1",
-    "babel-preset-es2015": "6.18.0",
+    "babel-preset-es2015": "6.24.0",
     "babel-register": "6.18.0",
     "chokidar-cli": "1.2.0",
     "conventional-changelog-cli": "1.3.1",