RELEASING.md

To release Brisk there are a few steps you need to take:

1. Update the Version and Build in the Info.plist to the version from the new release
2. Change the master section in the CHANGELOG.md to match the new release version. Don't add a new section for master changes yet
3. Commit both those changes on master with the message Bump version $VERSION
4. Tag the new commit with the version number of the release. Push the commit and the tag
5. Archive Brisk in Xcode
6. Create a tar.gz from the archived Brisk.app with tar -pvczf Brisk.app.tar.gz Brisk.app
7. Copy the output of shasum -a 256 Brisk.app Brisk.app.tar.gz for later
8. Draft a release on GitHub with the newly pushed tag
9. Title the release based on whatever feature / bugfix is "most important"
10. Fill the description with the contents of the changelog (you might need to join lines in the markdown to get it to render on a single line)
11. At the bottom of the description include the output of shasum from the previous step in triple backticks
12. Upload Brisk.app.tar.gz to the release
13. Save / create the release
14. In the appcast.xml, duplicate the top item, and paste it above
15. Change the title, enclosure url, sparkle:version, releaseNotesLink url to the new version
16. Get the size of the new Brisk.app.tar.gz with stat --printf="%s" Brisk.app.tar.gz. Replace length with that
17. Sign the release with path/to/sparkle/sign_update Brisk.app.tar.gz path/to/dsa_priv.pem. Replace the sparkle:dsaSignature with that
18. Update the pubDate with the output of date +"%a, %d %b %G %H:%M:%S %z"
19. Commit the appcast changes with the message Update appcast for $VERSION. Push the commit (note GitHub takes some time to propagate these changes)
20. Add a new master section in the CHANGELOG.md for future changes and commit it
21. Submit a PR to update the Brisk formula in homebrew-cask
22. Celebrate!