Merge pull request #4 from davidchase/greenkeeper-rollup-plugin-buble-0.13.0

Update rollup-plugin-buble to version 0.13.0 🚀

Author: davidchase

package.json

@@ -8,7 +8,7 @@
   },
   "devDependencies": {
     "buba": "2.0.2",
-    "rollup-plugin-buble": "0.12.1",
+    "rollup-plugin-buble": "0.13.0",
     "tap-spec": "4.1.1",
     "tape": "4.6.0"
   },