git mv *.hint -> README.md

There is one exception:

    $ find . -name '*.hint' -execdir git mv '{}' README.md \;
    git statufatal: destination exists, source=1992/albert/albert.hint, destination=1992/albert/README.md

Looking at the two files they differ quite a bit so I've not changed it.
I'll bring this up on GitHub.

1989/vanb/README.md

@@ -0,0 +1,40 @@
+Best one liner:
+
+	David Van Brackle
+	Department of Computer Science
+	University of Central Florida
+	Orlando, Florida 
+	32816
+	USA 
+
+Judges notes:
+
+	This program computes all proper subsets of the set of
+	arguments passed to it.  Each subset is printed with one 
+	element on each line, followed by a line of ten dashes.
+
+	Try:
+
+		vanb the rug gary lent	
+		vanb unix is better than os/2
+
+Selected notes from the author:
+
+	The program has the following charming and possibly 
+	non-portable features:
+
+	    * It has no local or global variables, 
+	      only the command-line parameters.
+
+	    * It calls main recursively.
+
+            * It alters the command-line parameters.
+
+            * It uses the fact that if the high bit is set in a character
+              variable, the value is negative.
+
+Copyright (c) 1989, Landon Curt Noll & Larry Bassel.
+All Rights Reserved.  Permission for personal, educational or non-profit use is
+granted provided this this copyright and notice are included in its entirety
+and remains unaltered.  All other uses must receive prior permission in writing
+from both Landon Curt Noll and Larry Bassel.