url instead of issue number

[Ana06]

I find in general a good practise to write in the commit message

Closes https://github.com/RomuloOliveira/commit-messages-guide/issues/32

Instead of

Closes #32

What do do you think? should we update this in the guide?

[RomuloOliveira]

@Ana06 I think it's a good idea to include both ways and discuss them (e.g., one is easy and straightforward to write and the other is better when using git log).

I'll add the enhancement label to this issue. Unfortunately, I haven't took the time I wanted to improve some things (I didn't forget #5).