* Update beta readme to reflect required rust version
* Update Changelog for 1.6.10 and 1.7.0 (#6183)
* Update changelog for 1.6.10
* Update changelog for 1.7.0
* Move 1.7.0 to top
* Rephrase contract warp
* Update final 1.7.0 changelog
* Update beta backports in Changelog
* Update SECURITY.md
