feat(git): added option to use --exclude option on git describe

[drmartini7]

Hello,

There is a small problem in which it isn't possible to exclude certain tags when generating new releases.

For example this image:

Latest commit has tag 15.5.2-rc.0, previous one has tag 15.5.1. I ran the git describe --tags --abbrev=0 as is used in GitBase, only changing the match argument:

• No match, obviously just returns latest tag;
• --match='[!-]*', as suggested here, it just returns the latest tag. Why it doesn't work eludes me, as according to glob(7) documentation, it should work.
• --match='[0-9]*.[0-9]*.[0-9]*': this one is suggested here, but it doesn't work since it uses the *, which allows any character, so everything fits.
• --exclude='*[-]*': this is the way git expects you to exclude a tag from the search as far as I could gather, so my PR aims to include this option on release-it.

There is another problem (which I guess has to do with this PR) that I could see on the tests and documentation, which I guess we could discuss here or I could open an issue to discuss it, but basically, many places on release-it use or suggest a --match which is something like [0-9].[0-9].[0-9], like this test for example. But this way only works for up to 9.9.9, never any double digits.

Some places use * to allow for more digits, but this has the side effect of allowing commits from pre-releases, which might not be what the user wants, like here for example.

Anyway, this isn't strictly to do with my PR, so it can be put aside or discussed on an issue if you wish.

Best Regards.

[webpro]

Thanks, @drmartini7 - as I think this is an improvement I went ahead and merged your PR, it's in v15.6.0. When I have more time I'll dive into the issues you mention again.