v4.3.3

Enhancements

• Add capture of expired client secret error - @RogerSelwyn

Maintenance

• Break up utilities for readability - @RogerSelwyn
• Code tidy up - @RogerSelwyn
• Code split up - @RogerSelwyn
• Revert "Code split up" - @RogerSelwyn
• Remove redundant utils.py - @RogerSelwyn
• Bump to v4.3.3 - @RogerSelwyn

Documentation

• Add chat event docs - @RogerSelwyn
• Add re-authentication info - @RogerSelwyn