if file extension is anything apart from lowercase, like Mp3 or MP3 ... then it's throwing error ``` mp3_tagger.exceptions.MP3OpenFileError: File must be MP3 format ``` https://github.com/artcom-net/mp3-tagger/blob/453ef8c22f688f8a28e95cd7298ea6ead60a0a4b/mp3_tagger/mp3.py#L87
if file extension is anything apart from lowercase, like Mp3 or MP3 ...
then it's throwing error
mp3-tagger/mp3_tagger/mp3.py
Line 87 in 453ef8c