v0.13.0

Fixes:

• Fix outdated command for dependencies with no releases. (#455, thanks @straight-shoota)
• Fix outdated command with non-release installed. (#456, thanks @straight-shoota)
• Write lockfile even when there are no dependencies. (#453, thanks @straight-shoota)
• Touch install_path and lockfile to express dependency. (#444, thanks @straight-shoota)
• Improve git reliability by retrying on failures. (#450, thanks @fudanchii)
• Allow empty scalar for mappings/sequences. (#451, thanks @straight-shoota)
• Fix working directory in capture. (#457, thanks @f-fr)

Features:

• Add a fallback to alternate shards commands. (#202, thanks @Willamin)

Others:

• Use git's checkout feature directly to write out repo files. (#435, thanks @oprypin)
• Use Process.quote instead of the old platform-specific helper. (#437, thanks @oprypin)
• Don't use POSIX-specific shell constructs. (#436, thanks @oprypin)
• Don't use compile-time shell commands to determine build timestamp. (#438, thanks @oprypin)
• Expand Windows support + fix all specs. (#447, thanks @oprypin)
• Add continuous testing (including Windows) using GitHub Actions. (#448, thanks @oprypin)
• Cleanup unused code. (#460, thanks @f-fr)
• Fix outdated content in the README.md and SPEC.md. (#434, #461, #462, thanks @kojix2, @straight-shoota, @kimburgess)