chore(package): update shelljs to version 0.8.2

Closes #13

Author: greenkeeper[bot]

package.json

@@ -43,7 +43,7 @@
     "jscs": "^3.0.7",
     "jshint": "^2.9.4",
     "mocha": "*",
-    "shelljs": "^0.7.5",
+    "shelljs": "^0.8.2",
     "standard-version": "4.0.0",
     "through2": "^2.0.3"
   },