fix: add release-beta script

Author: edeustace

package.json

@@ -13,6 +13,7 @@
     "it": "./node_modules/.bin/gulp it",
     "dev": "./node_modules/.bin/gulp dev",
     "release": "./node_modules/.bin/release-it",
+    "release-beta": "./node_modules/.bin/release-it --preRelease=beta",
     "source-maps": "gulp build && ./node_modules/.bin/tsc"
   },
   "repository": "pie-framework/pie-cli.git",