Fix Mark Schnitzius's URL in README.md files

As noted in commit 3958bbdb04:

    Updated URL for author as it has changed. It's very little on his
    page and the only page that suggests it is his is the ioccc.html
    page. I couldn't find anything else.

1993/schnitzi/README.md

@@ -1,9 +1,11 @@
 # Obfuscated Intelligence Award:
 
-Mark Schnitzius
-1700 Woodbury Rd. #1208
-Orlando, FL 32828
-USA
+Mark Schnitzius  
+1700 Woodbury Rd. #1208  
+Orlando, FL 32828  
+USA  
+<http://computronium.org/ioccc.html>  
+
 
 ## To build: