Do not modify frozen string

Author: aidanharan

lib/active_record/connection_adapters/sqlserver_adapter.rb

@@ -107,7 +107,7 @@ def dbconsole(config, options = {})
 
           if sqlserver_config[:host]
             host_arg = "tcp:#{sqlserver_config[:host]}"
-            host_arg << ",#{sqlserver_config[:port]}" if sqlserver_config[:port]
+            host_arg += ",#{sqlserver_config[:port]}" if sqlserver_config[:port]
             args += ["-S", host_arg]
           end