Added 2.5.0-rc.1 link

Author: antobinary

_posts/2.5/2021-06-09-new.md

@@ -140,6 +140,7 @@ Under the hood, BigBlueButton 2.5 installs on Ubuntu 20.04 64-bit, and the follo
 - Note that BigBlueButton 2.5 is the first iteration running on Ubuntu 20.04
 
 For full details on what is new in BigBlueButton 2.5, see the release notes. Recent releases:
+- [rc.1](https://github.com/bigbluebutton/bigbluebutton/releases/tag/v2.5.0-rc.1)
 - [beta.2](https://github.com/bigbluebutton/bigbluebutton/releases/tag/v2.5.0-beta.2)
 - [beta.1](https://github.com/bigbluebutton/bigbluebutton/releases/tag/v2.5.0-beta.1)
 - [alpha.6](https://github.com/bigbluebutton/bigbluebutton/releases/tag/v2.5.0-alpha.6)