Release v5.0.0

What's Changed

• Remove stray docs/conf.py from wheel by @claui in #143

Feature Flagging support

• Implement initial feature flag support by @efahk in #141
• Update py sdk exposure event tracking and add docs by @efahk in #144
• Updates to flag providers by @efahk in #146
• Updated salt support and convenience methods for flag providers by @efahk in #147

Full Changelog: 4.11.1...v5.0.0