Tag all releases published to crates.io

[andrewdavidmackenzie]

I notice that the most recent release on crates.io is 0.12.2, but the most recent release in the repo is 0.12.0.

I think it would be good to tag every release that ends up on crates.io.

[genusistimelord]

I try too XD but recently been very busy to remember to come back and do so. I will try to get it done more often with each release we do. worse case it just gets spread out a bit.