Version bump to v2.3.0.beta7

Version bump to v2.3.0.beta7

diff --git a/lib/version.rb b/lib/version.rb
index 65915cd..564196b 100644
--- a/lib/version.rb
+++ b/lib/version.rb
@@ -7,7 +7,7 @@ module Discourse
       MAJOR = 2
       MINOR = 3
       TINY  = 0
-      PRE   = 'beta6'
+      PRE   = 'beta7'
 
       STRING = [MAJOR, MINOR, TINY, PRE].compact.join('.')
     end

GitHub sha: 347e3e5a