chore(package): update lockfile

https://npm.im/greenkeeper-lockfile

Author: greenkeeperio-bot

yarn.lock

@@ -4280,9 +4280,9 @@ rollup-pluginutils@^2.0.1:
     estree-walker "^0.3.0"
     micromatch "^2.3.11"
 
-rollup@0.55.3:
-  version "0.55.3"
-  resolved "https://registry.yarnpkg.com/rollup/-/rollup-0.55.3.tgz#0af082a766d51c3058430c8372442ff5207d8736"
+rollup@0.55.5:
+  version "0.55.5"
+  resolved "https://registry.yarnpkg.com/rollup/-/rollup-0.55.5.tgz#2f88c300f7cf24b5ec2dca8a6aba73b04e087e93"
 
 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"