Hi!
I update Unity to 2017.3 version and update spine-unity runtime to spine-unity-3_6-2017-12-22.unitypackage.
It works correct in Unity Editor.
It got 198 errors at building for Android. More part of error is like: "Assets/Spine/spine-unity/Editor/AtlasAssetInspector.cs(37,7): error CS0246: The type or namespace name `UnityEditor' could not be found. Are you missing an assembly reference?"
I created a new blank project and imported spine-unity-3_6-2017-12-22.unitypackage. The result is the same.
Thank you!