chore(package): update shelljs to version 0.7.0

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -62,7 +62,7 @@
     "mocha": "^2.2.5",
     "q": "^1.0.1",
     "recursive-readdir": "^2.0.0",
-    "shelljs": "^0.6.0",
+    "shelljs": "^0.7.0",
     "yeoman-assert": "^2.0.0",
     "yeoman-test": "^1.1.0"
   },