chore: remove unused devDependencies (#540)

* chore: remove unused `devDependencies`

* chore: remove unused `devDependencies`

Author: snitin315

package.json

@@ -51,11 +51,8 @@
     "json-diff": "^0.5.4",
     "mocha": "^8.3.1",
     "npm-run-all": "^4.1.5",
-    "regenerate": "^1.4.0",
     "rollup": "^2.41.2",
-    "shelljs": "^0.3.0",
-    "shelljs-nodecli": "^0.1.1",
-    "unicode-6.3.0": "^0.7.5"
+    "shelljs": "^0.3.0"
   },
   "keywords": [
     "ast",