Show DB name in prompt

[kadrlica]

What do you think about having the prompt show the DB name? For example, this would replace:
DESDB ~>
with
DESSCI ~>
I think that the location for this change would be here and would look something like this:

        self.savePrompt = colored(
            '_________', 'magenta', self.ct) + '\n%s ~> '%(self.dbname.upper())