Taglib - enable Musepack

[nicolasmeric]

gonic version: v0.20.1

docker tag: v0.20.1

Hi I have tested gonic with taglib enabled for mpc files and it works fine.

So why not enable it in taglib.go:

func (Reader) CanRead(absPath string) bool {
	switch ext := strings.ToLower(filepath.Ext(absPath)); ext {
	case ".mp3", ".flac", ".aac", ".m4a", ".m4b", ".ogg", ".opus", ".wma", ".wav", ".wv", ".ape", ".mpc":
		return true
	}
	return false
}