Move 2014/vik bug notice from years to README.md

As the years.html file will be generated with a tool (yet to be written)
having the bug notice will (greatly)? complicate the generation. Thus
the bug notice (which I discovered when working on 2020/ferguson2) was
moved to 2014/vik/README.md.

But why? Because it is a good idea, I think, to note that although
mostly correct, there is a minor problem with it. I don't have a fix for
it but whether I ever look at that I do not know.

I also made a minor change in 2020/ferguson2/README.md: changed a full
stop to an exclamation mark as it seemed better.

years.html

@@ -903,10 +903,6 @@ Contest </I></FONT></CENTER>
 <LI><A HREF="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2014/vik/Makefile">Makefile</A>
 <LI><A HREF="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2014/vik/README.md">README.md</A>
 <LI><A HREF="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2014/vik/prog.c">prog.c</A>
-<LI>A minor bug that shows up in some cases was found by
-<a href="winners.html#Cody_Boone_Ferguson">Cody Boone Ferguson</a>
-when working on his <a href="#2020_ferguson2">2020 Enigma machine</a>. See his
-README.md file for details (search for vik).</LI>
 </UL>
 <A NAME="2014_wiedijk"></A>
 <P><B>wiedijk</B> - Y combinator</P>