v0.4.15-nightly

What's Changed

Build/Testing/CI

• [scripts] Make the scripts more simple (#737) by @bohutang

Dependency Updates

• Bump backtrace from 0.3.59 to 0.3.60 (#733) by @dependabot[bot]

Documentation

• [docs] Add CLA (#736) by @bohutang

Improvement

• [common] Remove unused deps which lint by cargo udeps (#739) by @bohutang
• [scripts] Make the scripts more simple (#737) by @bohutang
• [store/meta] refine: the same test cases should be applied to both state-machine and the meta server (#729) by @drmingdrmer