ActiveSupport CHANGELOG entry moved to correct place

activesupport/CHANGELOG

@@ -2,11 +2,11 @@
 
 * Removed ActiveSupport::SecureRandom in favour of SecureRandom from the standard library [Jon Leighton]
 
-*Rails 3.1.0 (unreleased)*
-
 * ActiveSupport::OrderedHash now has different behavior for #each and
 #each_pair when given a block accepting its parameters with a splat. [Andrew Radev]
 
+*Rails 3.1.0 (unreleased)*
+
 * Deprecated ActiveSupport::SecureRandom in favour of SecureRandom from the standard library [Jon Leighton]
 
 * New reporting method Kernel#quietly. [fxn]