chore(package): update lockfile

https://npm.im/greenkeeper-lockfile

Author: greenkeeperio-bot

yarn.lock

@@ -5119,7 +5119,15 @@ shell-quote@^1.6.1:
     array-reduce "~0.0.0"
     jsonify "~0.0.0"
 
-shelljs@^0.7.0, shelljs@^0.7.3, shelljs@^0.7.7, shelljs@^0.7.8:
+shelljs@0.8.0:
+  version "0.8.0"
+  resolved "https://registry.yarnpkg.com/shelljs/-/shelljs-0.8.0.tgz#12f561c52ec5d0d3315af15616c011a18ff80d59"
+  dependencies:
+    glob "^7.0.0"
+    interpret "^1.0.0"
+    rechoir "^0.6.2"
+
+shelljs@^0.7.0, shelljs@^0.7.3, shelljs@^0.7.8:
   version "0.7.8"
   resolved "https://registry.yarnpkg.com/shelljs/-/shelljs-0.7.8.tgz#decbcf874b0d1e5fb72e14b164a9683048e9acb3"
   dependencies: