Merge pull request #1222 from OAI/rc2-release-preparation

3.0.0-RC2 Release Preparation

Author: Ron

versions/3.0.md

@@ -3424,6 +3424,7 @@ Two examples of this:
 
 Version | Date | Notes
 ---   | --- | ---
+3.0.0-rc2 | 2017-06-16 | rc2 of the 3.0 specification
 3.0.0-rc1 | 2017-04-27 | rc1 of the 3.0 specification
 3.0.0-rc0 | 2017-02-28 | Implementer's Draft of the 3.0 specification
 2.0   | 2015-12-31 | Donation of Swagger 2.0 to the Open API Initiative