Merge pull request #22899 from y-yagi/move_changelog_entry

move CHANGELOG entry to the appropriate position [ci skip]

activesupport/CHANGELOG.md

@@ -8,13 +8,12 @@
 
     *Adam Roben*
 
-
-## Rails 5.0.0.beta1 (December 18, 2015) ##
-
 *   Add petabyte and exabyte numeric conversion.
 
     *Akshay Vishnoi*
 
+## Rails 5.0.0.beta1 (December 18, 2015) ##
+
 *   Add thread_m/cattr_accessor/reader/writer suite of methods for declaring class and module variables that live per-thread.
     This makes it easy to declare per-thread globals that are encapsulated. Note: This is a sharp edge. A wild proliferation
     of globals is A Bad Thing. But like other sharp tools, when it's right, it's right.