Add BytesIO in checking instance while initializing the Editor class

[riyuzenn]

When I'm getting the data of an image through url especially from the url of discord avatar, storing the data content in BytesIO rather than saving or downloading it makes it easier to work with.

[shahriyardx]

Actually easy_pil.utils has method called load_image(url) or load_image_async(url)

But thanks for your contribution. I will merge it after testing.