Works like a charm. There is a bug that chooses sorting layer and clicks "Add sorting layer", nothing happened but only warning message:
ExecuteMenuItem failed because there is no menu named 'Edit/Project Settings/Tags and Layers'
UnityEngine.StackTraceUtility:ExtractStackTrace ()
LightRays2DEditor:OnInspectorGUI () (at Assets/LightRays2D/Editor/LightRays2DEditor.cs:97)
UnityEditor.EditorGUI/PopupCallbackInfo:SetEnumValueDelegate (object,string[],int)