Merge tag 'v3.0.0-rc1' into develop

Added:

- Refresh button to reload mailbox contents
- Improved keyboard (tab) focus highlights

Changed:

- The UI now includes the Open Sans webfont instead of relying on browser/OS
  fonts

CHANGELOG.md

@@ -4,7 +4,7 @@ Change Log
 All notable changes to this project will be documented in this file.
 This project adheres to [Semantic Versioning](http://semver.org/).
 
-## [Unreleased]
+## [v3.0.0-rc1]
 
 ### Added
 - Refresh button to reload mailbox contents
@@ -239,6 +239,7 @@ No change from beta1.
   specific message.
 
 [Unreleased]:  https://github.com/inbucket/inbucket/compare/master...develop
+[v3.0.0-rc1]: https://github.com/inbucket/inbucket/compare/v3.0.0-beta3...v3.0.0-rc1
 [v3.0.0-beta3]: https://github.com/inbucket/inbucket/compare/v3.0.0-beta2...v3.0.0-beta3
 [v3.0.0-beta2]: https://github.com/inbucket/inbucket/compare/v3.0.0-beta1...v3.0.0-beta2
 [v3.0.0-beta1]: https://github.com/inbucket/inbucket/compare/v2.1.0...v3.0.0-beta1