fix incorrect version in deprecation message

Signed-off-by: Santiago Pastorino <santiago@wyeworks.com>

activerecord/lib/active_record/base.rb

@@ -1286,7 +1286,7 @@ def set_sequence_name(value = nil, &block)
 
       # Turns the +table_name+ back into a class name following the reverse rules of +table_name+.
       def class_name(table_name = table_name) # :nodoc:
-        ActiveSupport::Deprecation.warn("ActiveRecord::Base#class_name is deprecated and will be removed in Rails 2.3.9.", caller)
+        ActiveSupport::Deprecation.warn("ActiveRecord::Base#class_name is deprecated and will be removed in Rails 3.", caller)
 
         # remove any prefix and/or suffix from the table name
         class_name = table_name[table_name_prefix.length..-(table_name_suffix.length + 1)].camelize