[Unity] Auto update Text with the bundle version every time you build

BuildNumberLabel.cs

using UnityEngine;
using System.Collections;
using UnityEngine.UI;

[ExecuteInEditMode]
public class BuildNumberLabel : MonoBehaviour 
{
  #region inspector properties
  [SerializeField]
  private string format = "v. {0}"
  #endregion
  
#if UNITY_EDITOR
	void Awake()
	{
		// This works because Unity opens all scenes before creating a build
		var label = GetComponent<Text>();
		label.text = String.Format(format, UnityEditor.PlayerSettings.bundleVersion);
	}
#endif
}