Added notes about this release to History.txt

History.txt

@@ -1,6 +1,21 @@
 # coding: UTF-8
 
-=== 2.0.0.preview2 / 2012-11-29
+=== 2.0.0.preview2 / 2012-12-01
+
+As a preview release, please file bugs for any problems you have with RubyGems
+at https://github.com/rubygems/rubygems/issues.
+
+RubyGems 2.0 includes several new features and many breaking changes.  Some of
+these changes will cause existing software to break.  These changes are a
+result of improvements to the internals of RubyGems that make it more
+maintainable and improve APIs for RubyGems users.
+
+If you are using bundler be sure to install version 1.3.0.pre.  Older versions
+of bundler will not work with RubyGems 2.0.
+
+This release contains two commits not present in Ruby 2.0.0.preview2.  One
+commit is for ruby 1.8.7 support, the second allows RubyGems to work under
+$SAFE=1.  There is no functional difference compared to Ruby 2.0.0.preview2
 
 * Breaking changes: