UI images returned by get_image are missing methods in Pythonista 3.4

[felciano]

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In Pythonista 3.4, when running the following

my_image = appex.get_image(image_type="ui")
print(my_image.format)

you get a '_ui.Image' object has not attribute 'format'.

Based on this, these "ui" images should have the format method.

In case it matters, I'm using "ui" images as a workaround for https://github.com/omz/Pythonista-Issues/issues/702