chore(package): update lockfile

https://npm.im/greenkeeper-lockfile

Author: greenkeeperio-bot

yarn.lock

@@ -1507,9 +1507,9 @@ flat-cache@^1.2.1:
     graceful-fs "^4.1.2"
     write "^0.2.1"
 
-flow-bin@^0.48.0:
-  version "0.48.0"
-  resolved "https://registry.yarnpkg.com/flow-bin/-/flow-bin-0.48.0.tgz#72d075143524358db8901525e3c784dc13a7c7ee"
+flow-bin@0.49.1:
+  version "0.49.1"
+  resolved "https://registry.yarnpkg.com/flow-bin/-/flow-bin-0.49.1.tgz#c9e456b3173a7535a4ffaf28956352c63bb8e3e9"
 
 follow-redirects@0.0.7:
   version "0.0.7"