chore(package): update lockfile

https://npm.im/greenkeeper-lockfile

Author: greenkeeperio-bot

yarn.lock

@@ -1587,9 +1587,9 @@ flat-cache@^1.2.1:
     graceful-fs "^4.1.2"
     write "^0.2.1"
 
-flow-bin@^0.47.0:
-  version "0.47.0"
-  resolved "https://registry.yarnpkg.com/flow-bin/-/flow-bin-0.47.0.tgz#a2a08ab3e0d1f1cb57d17e27b30b118b62fda367"
+flow-bin@0.48.0:
+  version "0.48.0"
+  resolved "https://registry.yarnpkg.com/flow-bin/-/flow-bin-0.48.0.tgz#72d075143524358db8901525e3c784dc13a7c7ee"
 
 follow-redirects@0.0.7:
   version "0.0.7"