chore(package): update lockfile

https://npm.im/greenkeeper-lockfile

Author: greenkeeperio-bot

yarn.lock

@@ -162,9 +162,9 @@ ajv-keywords@^2.1.0:
   version "2.1.1"
   resolved "https://registry.yarnpkg.com/ajv-keywords/-/ajv-keywords-2.1.1.tgz#617997fc5f60576894c435f940d819e135b80762"
 
-[email protected].0:
-  version "6.1.0"
-  resolved "https://registry.yarnpkg.com/ajv/-/ajv-6.1.0.tgz#adc4b3dd64b2d8740d13c5b38e4596115970e59d"
+[email protected].1:
+  version "6.1.1"
+  resolved "https://registry.yarnpkg.com/ajv/-/ajv-6.1.1.tgz#978d597fbc2b7d0e5a5c3ddeb149a682f2abfa0e"
   dependencies:
     fast-deep-equal "^1.0.0"
     fast-json-stable-stringify "^2.0.0"