SwiftOpenAI v3.7.0

Fixing version issues.

What's Changed

• Remove 'some' from factory return type by @lzell in #73
• Touch up the AIProxy section of README by @lzell in #72
• Fixup sample project after removing 'some' from factory methods by @lzell in #74
• Fix for chat stream demo with function call. by @jamesrochabrun in #77
• Adding support for JsonSchema as response format. by @jamesrochabrun in #78
• Demo for structured outputs in response format. by @jamesrochabrun in #79
• Support for Structure outputs in tools by @jamesrochabrun in #80
• Updating READ.me by @jamesrochabrun in #81

Full Changelog: v3.6.2...v3.7