v0.2.0

Added

• Publish pre-built Linux ARM binaries.
• {branch, stack, upstack, downstack} submit: Add --force flag. This acts like 'git push --force'.

Changed

• cli: Show --help when run without arguments

Fixed

• branch submit: Fix incorrect warning about current branch not being tracked when --no-publish is used.
• branch submit: Fix bug where updating an open PR would overwrite changes pushed to it by others. Use --force to overwrite these changes.
• branch submit: Use the same editor used by Git for commit messages to author the PR body.
• branch submit: Allow Git editor to be a shell command, not just an executable name.
• {downstack, stack} edit: Use Git editor to edit list of branches.