Typo fixes in 1992/nathan

In nathan.c there was also a typo fix but since it's not the original
entry (or any thing like it) it's okay to do this. This is actually the
subject of a discussion to be had on GitHub which I'll be addressing in
a bit.

In README.md there was also a typo fixed.

1992/nathan/nathan.c

@@ -11,7 +11,7 @@ static char *text[] =
   "with a subject \"IOCCC request\". If you know that your 'From'",
   "line is incorrect, add a single line",
   "\"replyto you@your.correct.address\" to the body of the message.",
-  "A deamon will autoreply.",
+  "A daemon will autoreply.",
   "WARNING: You must not re-export this out of the USA, or else",
   "the men in black might get you.",
   NULL