Add release procedure to docs

[katowulf]

When you have a few spare cycles, could you document the release procedure?

I tried to work through this today and couldn't figure it out without expending energy and thought. I presume you want it to work something like this? Am I missing any steps?

gulp test
git tag <version number>
git push origin --tags
# edit package.json's version number
gulp release
# edit release info on GitHub

[bendrucker]

It's literally just exactly what's documented in MAINTAINING.md:

To bump to 1.0:

gulp release --type major
git push --follow-tags

The GH release stuff can probably be done via the API but for now would be manual