chore(package): update rollup-plugin-buble to version 0.19.2

Closes #269

Author: greenkeeper[bot]

package.json

@@ -76,7 +76,7 @@
     "pre-commit": "^1.2.2",
     "rimraf": "^2.6.2",
     "rollup": "^0.52.0",
-    "rollup-plugin-buble": "^0.18.0",
+    "rollup-plugin-buble": "^0.19.2",
     "rollup-plugin-commonjs": "^8.2.1",
     "rollup-plugin-node-resolve": "^3.0.0",
     "rollup-plugin-replace": "^2.0.0",