Version up to 5.4

Author: ManlyMarco

RuntimeUnityEditor/RuntimeUnityEditorCore.cs

@@ -24,7 +24,7 @@ public class RuntimeUnityEditorCore
         /// Beware that this is a const and it will be burned as a string into your assembly at build time.
         /// To see the version that is currently installed use <see cref="InstalledVersion"/>.
         /// </summary>
-        public const string Version = "5.3.1";
+        public const string Version = "5.4";
 
         /// <summary>
         /// Get the currently installed version at runtime.