chore(package): update lockfile

https://npm.im/greenkeeper-lockfile

Author: greenkeeperio-bot

yarn.lock

@@ -4008,9 +4008,9 @@ preserve@^0.2.0:
   version "0.2.0"
   resolved "https://registry.yarnpkg.com/preserve/-/preserve-0.2.0.tgz#815ed1f6ebc65926f865b310c0713bcb3315ce4b"
 
-[email protected].1:
-  version "1.8.1"
-  resolved "https://registry.yarnpkg.com/prettier/-/prettier-1.8.1.tgz#91064d778c08c85ac1cbe6b23195c34310d039f9"
+[email protected].2:
+  version "1.8.2"
+  resolved "https://registry.yarnpkg.com/prettier/-/prettier-1.8.2.tgz#bff83e7fd573933c607875e5ba3abbdffb96aeb8"
 
 pretty-format@^21.2.1:
   version "21.2.1"