Add another version string to be changed by release runner (#111)

Author: jakub-grzesiowski

.github/workflows/release/versions.json

@@ -21,5 +21,11 @@
       "clearedPrefix": true,
       "clearedSuffix": false
     }
+  ],
+  "PubNubUnity/Assets/PubNub/Runtime/Util/UnityPNSDKSource.cs": [
+    {
+      "pattern": "^\\s{2,}private const string build = \"(v?(\\.?\\d+){2,}([a-zA-Z0-9-]+(\\.?\\d+)?)?)\";",
+      "cleared": true 
+    }
   ]
 }