Migration to exifr lost PNG support

[Salketer]

Hello, I am receiving a "Unknown file format" when using this with some PNG files. My guess is it works if there is no need to compress the PNG passed, but crashes otherswise.

The error comes from exifr, and there is an open issue to allow for PNGs : MikeKovarik/exifr#19

I suggest we just skip the exif read if it is a png for now?

[MikeKovarik]

Hello, I'm currrently working on png support. It will be available in the next exifr version. After that you could just bump version

[MikeKovarik]

Exifr 6.0.0 is now released