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.

1988/isaak/README.md

@@ -0,0 +1,49 @@
+Best visuals:
+
+    	Mark Isaak
+	Imagen Corporation
+	2650 San Tomas Expy.
+	Santa Clara, CA 
+	95052-8101
+	USA
+
+Compile with:
+
+	cc -DI=B -DO=- -Dy isaak.c -o isaak
+
+Execute without arguments.
+
+The original entry starts with the line:
+
+	main(){};
+
+This works on some 4.3BSD systems.  Why?  Note that #include <stdio.h>
+is given on the last line.  Why is this needed?  Note the unusual calls
+to sprintf.
+
+NOTE:  The program relies heavily on ASCII.  Don't even think of
+       running it on an EBCDIC machine.  If you name the file anything 
+       other than "isaak.c", you must change the #include on line 7.
+
+NOTE: The use of null comments to separate macros to construct different 
+      tokens from a single macro (e.g., "O/**/O" creates either "++" or "--" 
+      by defining "O" to be "+" or "-") may cause some strict ANSI
+      C preprocessors to object.
+
+NOTE: Most System V machines will not be able to execute this program
+      correctly due to the fact that BSD style systems have an sprintf()
+      that returns a char *.
+
+Due to the above problems, we have replaced the output of this program
+in the file: isaak.encode.  To read this file do:
+
+	uudecode < isaak.encode
+	cat isaak.output
+
+FYI: We are likely to be more strict about portability in the future.
+
+Copyright (c) 1988, 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.