v0.20.0

Added

• commit: Add '--signoff' flag to add Signed-off-by trailer to commit messages. Enable for all commits with the 'spice.commit.signoff' configuration option.
• branch create: Add 'spice.branchCreate.generatedBranchNameLimit' configuration option to customize the length of branch names generated from commit titles.
• submit: Add 'spice.submit.navigationComment.downstack' configuration option to control whether merged CRs appear in stack navigation comments.

Changed

• all: --help messages now include configuration options for each command.
• submit: CR creation title prompt now allows choosing from the titles of all available commits instead of always using the first. Use up/down arrow keys to navigate.
• submit: The prompt to confirm submission of empty branches now also considers branches with non-zero commits but no effective changes. This helps catch submission of empty commits or entirely reverted changes.

Fixed

• repo sync: Avoid prompting to delete branches that have both merged and open externally created CRs -- assume the user wants to keep the branch.
• Fix data race in reading GraphQL responses from GitHub where buffers could be reused while response bodies were still being read.
• Fix crash when information for a branch could not be loaded from Git.