chore(package): update shelljs to version 0.8.0

Author: greenkeeper[bot]

package.json

@@ -73,7 +73,7 @@
     "react-test-renderer": "^16.2.0",
     "readline-sync": "^1.4.7",
     "replace-in-file": "^3.1.0",
-    "shelljs": "^0.7.7",
+    "shelljs": "^0.8.0",
     "shx": "^0.2.2",
     "ts-jest": "^22.0.0",
     "typedoc": "^0.9.0",