Version bump to v2.8.0.beta4 (#13824)

Version bump to v2.8.0.beta4 (#13824)

diff --git a/lib/version.rb b/lib/version.rb
index 88a32aa..bd5490b 100644
--- a/lib/version.rb
+++ b/lib/version.rb
@@ -10,7 +10,7 @@ module Discourse
       MAJOR = 2
       MINOR = 8
       TINY  = 0
-      PRE   = 'beta3'
+      PRE   = 'beta4'
 
       STRING = [MAJOR, MINOR, TINY, PRE].compact.join('.')
     end

GitHub sha: cb858af8c79032a90bc374d566225c75e22cf6a6

This commit appears in #13824 which was approved by eviltrout. It was merged by nlalonde.