add historical update to the historical mirror note

2012/README.md

@@ -19,6 +19,14 @@ The IOCCC has a website and now has a number of international mirrors.
 The primary website can be found at [www.ioccc.org](https://www.ioccc.org).
 
 
+### Historical update:
+
+The IOCCC website once had a number of
+[international mirrors](https://web.archive.org/web/20201030210517/https://www.ioccc.org/mirror.html).
+As of 2020 Dec 29, [GitHub](https://www.github.com) serves as the distributed server farm for the
+[IOCCC winner repo](https://github.com/ioccc-src/winner) that GitHub renders as
+[Official IOCCC web site - www.ioccc.org](https://www.ioccc.org).
+
 
 ## Remarks on some of the entries