v1.4 - First version that I had written

First of all, fixed everything (I hope, if not create an issue please).
I also my some quality of life changes, like get_player auto-calls create_player if there isn't one:

# before:
player = music.get_player(guild_id=ctx.guild.id)
if not player:
    player = self.music.create_player(ctx, ffmpeg_error_betterfix=True)

# after:
player = music.get_player(ctx)

Full Changelog: https://github.com/pintermor9/disutils/commits/v1.4