chore(package): update lockfile

https://npm.im/greenkeeper-lockfile

Author: greenkeeperio-bot

yarn.lock

@@ -4157,9 +4157,9 @@ rollup-pluginutils@^2.0.1:
     estree-walker "^0.3.0"
     micromatch "^2.3.11"
 
-[email protected].3:
-  version "0.53.3"
-  resolved "https://registry.yarnpkg.com/rollup/-/rollup-0.53.3.tgz#e7b6777623df912bd0ca30dc24be791d6ebc8e5a"
+[email protected].4:
+  version "0.53.4"
+  resolved "https://registry.yarnpkg.com/rollup/-/rollup-0.53.4.tgz#f92ce56ee1d097ad5b6f13951bc80db5fef18113"
 
 safe-buffer@^5.0.1, safe-buffer@^5.1.0, safe-buffer@^5.1.1, safe-buffer@~5.1.0, safe-buffer@~5.1.1:
   version "5.1.1"