convert INABIAF headers in README.md to a Jargon File quote

We introduce a bit of fun, while specifying that something
is "supposed to happen".

NOTE: There is no need to change the INABIAF STATUS.  The use
there is perfectly fine.

2005/anon/README.md

@@ -49,13 +49,18 @@ make alt
 
 Use `anon.alt` as you would `anon`.
 
-### INABIAF - it's not a bug it's a feature! :-)
-
 After a very large number of moves this program will deliberately force itself
 to destroy its runtime stack. This is the author's way to prevent you from being
 frustrated (which might happen as it likes to create unsolvable puzzles just to
 hook you) and spending too much time playing. :-)
 
+This is supposed to happen.  As is written in the
+[The Jargon File](http://catb.org/jargon/html/F/feature.html):
+
+```
+That's not a bug, that's a feature.
+```
+
 If you want to see this in action you can easily do this with the alt version:
 
 ```sh