[committed] Update my e-mail address, limit maintenance to MIPS I-IV ISAs

[Nick Clifton]

Hi Maciej,

>  It's my last day at MIPS Tech today, so I'll be stepping down as a 
> general MIPS target maintainer  

I just wanted to say a big *THANK YOU* on behalf of us all, for all 
the work that you have done with the binutils, gdb and everywhere 
else too.

Cheers
  Nick