refactor: remove shelljs dependency (#842)

Co-authored-by: エリス <erisu@users.noreply.github.com>

package.json

@@ -34,9 +34,10 @@
     "compare-func": "^1.3.2",
     "cordova-common": "^3.2.0",
     "execa": "^3.2.0",
+    "fs-extra": "^8.1.0",
     "nopt": "^4.0.1",
     "properties-parser": "^0.3.1",
-    "shelljs": "^0.5.3"
+    "which": "^1.3.1"
   },
   "devDependencies": {
     "eslint": "^5.12.0",