message: update yarn lock with newest yarn version
diff: @@ -3197,10 +3197,6 @@ prettier@^1.7.4:
  version "1.9.1"
  resolved "https://registry.yarnpkg.com/prettier/-/prettier-1.9.1.tgz#41638a0d47c1efbd1b7d5a742aaa5548eab86d70"
  -prettier@^1.8.2:
  - 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"
  resolved "https://registry.yarnpkg.com/pretty-format/-/pretty-format-21.2.1.tgz#ae5407f3cf21066cd011aa1ba5fce7b6a2eddb36"
  