Document new command line options

Because `perldoc reply` doesn't mention them.
On Thu, Jul 10, 2014 at 08:06:53AM -0700, Toby Inkster wrote:
> > @@ -8,7 +8,7 @@ use Reply::App;
> >  
> >  =head1 SYNOPSIS
> >  
> > -  reply [-lb] [-I dir] [-M mod] [--version] [--help] [--cfg file]
> 
> They made the SYNOPSIS wrap when it was displayed in a 80x24 terminal.
> 
> `--help` and `--version` are still documented under "OPTIONS".

There's nothing wrong with (hard-)wrapping - see 'man git', for
instance. I don't see any reason to arbitrarily limit what's in the
synopsis like that.