Changelog generation requires annotating commits with a commit type,
otherwise the tests will fail. This is annoying for contributors, since
it's unusual, and I often myself forget to do it, causing a round-trip
with tests.
So, skip generating the changelog during the tests. Also, change the
`--no-git` option for `gen book` and `gen all` to `--no-changelog`, so
it's clearer what it does.
I think I'll wind up just making a YAML file that contains commit types,
for changelog generation, so it doesn't have to be done in the commit
message.
type: testing
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