add missing .

Author: mdo

_config.yml

@@ -50,7 +50,7 @@ social_logo_path:   /assets/brand/bootstrap-social-logo.png
 
 # Custom variables
 current_version:      4.0.0-beta.2
-current_ruby_version: 4.0.0-beta2
+current_ruby_version: 4.0.0.beta2
 docs_version:         4.0
 repo:                 "https://github.com/twbs/bootstrap"
 slack:                "https://bootstrap-slack.herokuapp.com"