chore(package): update babel-plugin-transform-es2015-classes to version 6.24.1

https://greenkeeper.io/

Author: greenkeeper[bot]

package.json

@@ -47,7 +47,7 @@
     "babel-plugin-transform-es2015-arrow-functions": "6.22.0",
     "babel-plugin-transform-es2015-block-scoped-functions": "6.22.0",
     "babel-plugin-transform-es2015-block-scoping": "6.24.1",
-    "babel-plugin-transform-es2015-classes": "6.22.0",
+    "babel-plugin-transform-es2015-classes": "6.24.1",
     "babel-plugin-transform-es2015-computed-properties": "6.24.1",
     "babel-plugin-transform-es2015-destructuring": "6.23.0",
     "babel-plugin-transform-es2015-duplicate-keys": "6.24.1",