Release command needs some fixes

[humphd]

I just did a release for 0.6.0, and it worked really well. For reference, here is what it looked like:

$ npm run release --dry-run

> @seneca/[email protected] release /Users/humphd/repos/telescope
> run.env release-it --

✔ npm run test-ci

🚀 Let's release @seneca/telescope (currently at 0.0.1)


Empty changelog

? Select increment (next version): Other, please specify...
? Please enter a valid version: 0.6.0

Empty release notes


Changeset:
M package.json

? Commit (Release 0.6.0)? Yes
? Tag (0.6.0)? Yes
? Push? Yes
? Create a release on GitHub (Release 0.6.0)? Yes
? Publish @seneca/telescope to npm? No
🔗 https://github.com/Seneca-CDOT/telescope/releases/tag/0.6.0
🏁 Done (in 171s.)

This generated a new GitHub Release, updated our package.json version, and pushed to GitHub.

Only 2 things that I can see didn't work:

1. I used the --dry-run flag to test the process without actually doing it. But the way I'm passing args to the command doesn't seem to work, or the --dry-run flag is wrong (but docs talk about it)
2. The changelog wasn't generated from the Git log. We should fix this, so we get automatic release notes. The docs talk about how to do it.