Make pypng an extra dependency #338
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There are uses of qrcode that do not require image support; e.g. FreeIPA uses qrcode only for print_ascii(). Allow such use cases to require qrcode without depending upon pypng, while leaving it the fallback provider for make_image().
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There are uses of qrcode that do not require image support; e.g. FreeIPA uses qrcode only for print_ascii(). Allow such use cases to require qrcode without depending upon pypng, while leaving it the fallback provider for make_image().