Release HOWTO

since I forget.

Review existing tags and pick new release number
```
git tag
```
Tag locally
```
git tag -a v0.1.0 -m "First release"
```
If things get screwed up, delete the tag with
```
git tag -d v0.1.0
```
Test goreleaser

TODO: how to install goreleaser
```
./scripts/goreleaser-dryrun.sh
```
Push
```
git push origin v0.1.0
```
Verify release and edit notes. See https://github.com/client9/misspell/releases