Update Active Model xml serialization test to reflect a change in builder

Due to a change in builder, nil values and empty strings now generates
closed tags, so instead of this:

    <pseudonyms nil=\"true\"></pseudonyms>

It generates this:

    <pseudonyms nil=\"true\"/>

Document this change in Rails so that people can track it down easily if
necessary.

Conflicts:
	activemodel/CHANGELOG.md

1 files changed, 13 insertions, 0 deletions

diff --git a/activemodel/CHANGELOG.md b/activemodel/CHANGELOG.md
index 2a3c51172b..d3056e73a2 100644
--- a/activemodel/CHANGELOG.md
+++ b/activemodel/CHANGELOG.md
@@ -1,3 +1,16 @@
+## Rails 3.2.9 (unreleased)
+
+*   Due to a change in builder, nil values and empty strings now generates
+    closed tags, so instead of this:
+
+        <pseudonyms nil=\"true\"></pseudonyms>
+
+    It generates this:
+
+        <pseudonyms nil=\"true\"/>
+
+    *Carlos Antonio da Silva*
+
 ## Rails 3.2.8 (Aug 9, 2012) ##
 
 *   No changes.