Auto increment pre-release version to 2.3.0-pre-release.1 [skip ci]

package.json

@@ -1,13 +1,15 @@
 {
   "name": "com.unity.uiextensions",
   "displayName": "Unity UI Extensions",
-  "version": "2.3.0",
+  "version": "2.3.0-pre-release.1",
   "description": "An extension project for the Unity3D UI system, all crafted and contributed by the awesome Unity community",
   "author": "Simon darkside Jackson <@SimonDarksideJ>",
-  "contributors": [{
+  "contributors": [
+    {
       "name": "SimonDarksideJ",
       "twitter": "@SimonDarksideJ"
-}],
+    }
+  ],
   "unity": "2020.3",
   "repository": {
     "type": "git",