Add fun link to 2020/ferguson1/play.sh

Did you know some people believe in snake human hybrids? I added a link to the
script that discusses this and gives supposed examples.

2020/ferguson1/play.sh

@@ -35,7 +35,11 @@
 # (added 16 August 2020). This will start you at 400 and every 100 movements you
 # would lose 5 in length; when you eat a bug you would grow by 5 (default).
 #
-# Last updated: 15 April 2023
+# BTW: did you know that some people believe in snake human hybrids? It's true! See
+# http://www.macroevolution.net/snake-human-hybrids.html and have a laugh, shock
+# or an exercise in sibilance!
+#
+# Last updated: 01 March 2024
 #
 COLOUR[0]="BLACK"
 COLOUR[1]="RED"