push tags for each release

[felipesanches]

it would be nice to have tags every time we make a new release

for now we only have a 0.1.0 tag even though there's been a lot of other more recent releases

[kontur]

Adding gftools to the build requirements for Signika I would like to reference the current release, so this would be useful indeed. Now I'm referencing the latest commit to specify a reproducible dependency tree.

[alerque]

Yes please. I'm having trouble debugging gftools issues because the Pypi releases are not correlated with git tags, so checking the logs and bisecting to figure out what changed / broke my font builds is very tedious and manual. Please add git tags for each version bump at the commit that was used to push Pypi releases.

[m4rc1e]

@alerque Please could you open an issue? Just dump the traceback and I'll get back to you asap.

[m4rc1e]

Added in #265.