v0.15.0-preview01

Added

• Helpers for getting IWebHostEnvironment and IConfiguration in context of application CE (by @Krzysztof-Cieslak)
• [Infrastructure] Add performance benchmark using wrk and GitHub Action to run it

Changed

• Use IWebHostEnvironment internally (by @Krzysztof-Cieslak)
• Move application CE to IHostBuilder (by @Krzysztof-Cieslak)
• [Infrastructure] Moved to CHANGELOG.md from RELEASE_NOTES.md (by @Krzysztof-Cieslak)
• [Infrastructure] Updated SDK to 3.1.301 (by @Krzysztof-Cieslak)
• [Infrastructure] Added GitHub action to publish new version of Saturn (by @Krzysztof-Cieslak)
• [Infrastructure] Update FAKE build script (by @Krzysztof-Cieslak)

Removed

• Removed support for netstandard2.0 (by @Krzysztof-Cieslak)
• Removed any obsolete APIs (by @Krzysztof-Cieslak)
• Remove deprecated OpenIdConnect extension (by @Krzysztof-Cieslak)