v0.4.0

What's Changed

• [1/1]: Fix a bug where we accidentally --force pushed all refs by @slinder1 in #14
• [1/2]: Add a note about maintaining merged reviews by @slinder1 in #15
• [2/3]: Add link to DESIGN.md in help text by @slinder1 in #16
• [3/3]: Allow changes with empty commits to have merged PRs by @slinder1 in #17
• [1/5]: Ignore empty changes as needed by @slinder1 in #20
• [2/5]: Add comment about potential improvement to push_all by @slinder1 in #19
• [3/5]: Make fetch_all on empty iter a no-op by @slinder1 in #18
• [4/5]: Fix bug in fetch_all by @slinder1 in #21
• [5/5]: Handle empty commits in more places by @slinder1 in #22

Full Changelog: v0.3.0...v0.4.0