!

Or more specifically: add missing sentence ending which happens to be a
'!'. Changed 'PLEASE don't' to 'PLEASE DO NOT' in bold (with NOT in
italics too) to stress the point that the judges do NOT want people to
program in the style of IOCCC programs (but where's the fun in that,
Landon? :-) okay I'm joking .. maybe :-) ).

README.html

@@ -524,7 +524,7 @@ entries. The rules, and sometimes the contest email address itself, change from
 time to time. A valid entry one year may be rejected in a later year due to
 changes in the rules. See <a href="news.html">news.html</a> for up to
 date information on how to enter.</p>
-<p>Last, PLEASE don’t code in the style of these programs It is hoped that you will
+<p>Last, <strong>PLEASE DO <em>NOT</em></strong> code in the style of these programs! It is hoped that you will
 gain an understanding that poor style destroys an otherwise correct program.
 Real programmers don’t write obfuscated programs, unless they are submitting a
 contest entry! :-)</p>

README.md

@@ -191,7 +191,7 @@ time to time.  A valid entry one year may be rejected in a later year due to
 changes in the rules.  See [news.html](news.html) for up to
 date information on how to enter.
 
-Last, PLEASE don't code in the style of these programs It is hoped that you will
+Last, **PLEASE DO *NOT*** code in the style of these programs! It is hoped that you will
 gain an understanding that poor style destroys an otherwise correct program.
 Real programmers don't write obfuscated programs, unless they are submitting a
 contest entry!  :-)