chore(package): update lockfile

https://npm.im/greenkeeper-lockfile

Author: greenkeeperio-bot

yarn.lock

@@ -43,9 +43,9 @@
   version "9.4.7"
   resolved "https://registry.npmjs.org/@types/node/-/node-9.4.7.tgz#57d81cd98719df2c9de118f2d5f3b1120dcd7275"
 
-"@types/shelljs@^0.7.8":
-  version "0.7.8"
-  resolved "https://registry.npmjs.org/@types/shelljs/-/shelljs-0.7.8.tgz#4b4d6ee7926e58d7bca448a50ba442fd9f6715bd"
+"@types/shelljs@^0.8.0":
+  version "0.8.0"
+  resolved "https://registry.npmjs.org/@types/shelljs/-/shelljs-0.8.0.tgz#0caa56b68baae4f68f44e0dd666ab30b098e3632"
   dependencies:
     "@types/glob" "*"
     "@types/node" "*"