chore(deps): update dependency shelljs to v0.8.3 (#333)

Author: renovate[bot]

package.json

@@ -66,6 +66,6 @@
     "mock-git": "2.0.0",
     "mockery": "2.1.0",
     "nyc": "14.1.0",
-    "shelljs": "0.7.8"
+    "shelljs": "0.8.3"
   }
 }