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.

1992/albert/README.md

@@ -0,0 +1,22 @@
+From: leo _at_ zycad -dot- com (Leo Broukhis)
+Date: Tue, 30 Jan 96 17:37:51 PST
+To: judges _at_ toad -dot- com
+Subject: IOCCC 1992 - a bug
+
+Dear Judges,
+
+albert.c (even in its fixed form) still has a bug. Although I don't
+remember the number that exposed the bug (afair, resulting in coredump)
+in albert.orig.c that has been fixed in albert.c,
+I've found a number exposing another bug: 10000000001 (that's 9 0's).
+Both albert and albert.orig loop without printing anything, although
+the first factor is 101 and is usually found in an instant.
+
+Unfortunately, the e-mail address in albert.hint is no longer valid,
+and neither whois, nor replacing old domain name with a new one according
+to the MX records, nor Altavista Web search were successful.
+
+...Fortunately, Albert van der Horst did send me an unobfuscated
+(but somewhat limited - it doesn't check the number for factors 2, 3, 5, 7)
+version of his program. I didn't have a chance to augment its functionality
+to the one of the contest entry.