delete mention of defaults from README

Author: thorstenkampe

README.adoc

@@ -10,7 +10,6 @@ Modern SQL shells like `mssql-cli`, `mycli`, `SQLcl` and `pgcli` are very conven
 `SQL Shell` makes using SQL clients even more convenient:
 
 * a standard interface to enter connection parameters so you don't have to remember command line options
-* defaults for host name, port, and user to save you time
 * pre-defined connection strings for connection without typing
 * automatic tunneling if your database is behind a firewall or listening only on localhost interface
 * legacy client support