chore(package): update lockfile

https://npm.im/greenkeeper-lockfile

yarn.lock

@@ -2715,9 +2715,9 @@ rollup-pluginutils@^2.0.1:
     estree-walker "^0.3.0"
     micromatch "^2.3.11"
 
-rollup@^0.53.0:
-  version "0.53.3"
-  resolved "https://registry.yarnpkg.com/rollup/-/rollup-0.53.3.tgz#e7b6777623df912bd0ca30dc24be791d6ebc8e5a"
+rollup@0.54.1:
+  version "0.54.1"
+  resolved "https://registry.yarnpkg.com/rollup/-/rollup-0.54.1.tgz#415a5d999421502646cf54b873fc4ce1a7393970"
 
 run-async@^2.2.0:
   version "2.3.0"