Release v0.1.0-beta4 (#177)

Author: abhinav

.changes/unreleased/Added-20240605-082245.yaml

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+## v0.1.0-beta4 - 2024-06-10
+### Added
+- repo sync: Detect PRs for local branches created and merged externally.
+- Add 'log short' command (alias 'ls') to print the current stack. Use with `--all` to print all tracked branches.
+### Changed
+- (*Breaking*) Rename `completion` to `shell completion`. Other shell helpers are expected in the future.
+- branch submit: Delay fetching PR templates until necessary. This should result in an apparent speed-up in the submission prompt.
+- branch submit: Make fewer requests to GitHub for PR templates by caching them locally.
+### Fixed
+- branch delete: When prompting for branch selection, select current branch by default.
+- {branch, upstack} onto: When prompting for a new base, default to current base.
+- Fix bug in state management attempting to write files with empty names to state.
+- shell completion: Command aliases can now be completed.