chore(package): update lockfile

https://npm.im/greenkeeper-lockfile

Author: greenkeeperio-bot

yarn.lock

@@ -4143,9 +4143,9 @@ rollup-pluginutils@^2.0.1:
     estree-walker "^0.3.0"
     micromatch "^2.3.11"
 
-rollup@0.53.0:
-  version "0.53.0"
-  resolved "https://registry.yarnpkg.com/rollup/-/rollup-0.53.0.tgz#7a3d5a04ba2b0a8f2405899fa6a0ac48da480ed1"
+rollup@0.53.1:
+  version "0.53.1"
+  resolved "https://registry.yarnpkg.com/rollup/-/rollup-0.53.1.tgz#58c3a43c8375385b3f92f0dc36fb4e9dbe872542"
 
 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"