When adding an image (off url) with extension of jpeg for itunes images - it fails the extension check.

[psyciknz]

Any chance of updating the allowed extensions to the include .jpeg?

if itunes_image is not None:
            if itunes_image.endswith('.jpg') or itunes_image.endswith('.png'):
                self.__itunes_image = itunes_image
            else:
                raise ValueError('Image file must be png or jpg')
        return self.__itunes_image

https://github.com/lkiesow/python-feedgen/blob/97260abb1793eb164c458c10b493690beb413f6d/feedgen/ext/podcast_entry.py#L149