v2.3.0

Salsa v2.3.0

Diff since v2.2.0

Merged pull requests:

• Upstream from RelationalAI: Package Refactoring (#38) (@comnik)
• README updates (#40) (@tomasrelai)
• avoid potential compiler-internal error (#42) (@aviatesk)
• Migrate everything to test item framework (#43) (@davidanthoff)
• Fix a bug in the swap optimization (#44) (@davidanthoff)