[m should behave as [0m

[P4Cu]

Hey,
First of all, thanks for this crate!

I've noticed that git log --graph uses [m escape sequence to reset which behaves as [0m reset.
A simple .replace("[m", "[0m") does the trick for me but I think it might make sense to also handle it in this crate.

[uttarayan21]

thanks for the report. It's been fixed in #42