Merge pull request #191 from matthewkrom/patch-1

Update ibm_db_adapter.rb

Author: praveen-db2

IBM_DB_Adapter/ibm_db/lib/active_record/connection_adapters/ibm_db_adapter.rb

@@ -852,6 +852,8 @@ def initialize(args)
                 @servertype = IBM_DB2_ZOS.new(self, @isAr3)
               when /12/
                 @servertype = IBM_DB2_ZOS.new(self, @isAr3)
+              when /13/
+                @servertype = IBM_DB2_ZOS.new(self, @isAr3)
               when /08/             # DB2 for zOS version 8
                 @servertype = IBM_DB2_ZOS_8.new(self, @isAr3)
               else # DB2 for zOS version 7