[genius] Fix category

[George Lebl <jirka src gnome org>]

commit f527e3accf59a5f91f189af4471da3b62ae114a7
Author: Jiri (George) Lebl <jiri lebl gmail com>
Date:   Fri Sep 5 12:58:07 2014 -0500

    Fix category

 tutors/strange-attractor.gel |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/tutors/strange-attractor.gel b/tutors/strange-attractor.gel
index 248508d..536b9c0 100644
--- a/tutors/strange-attractor.gel
+++ b/tutors/strange-attractor.gel
@@ -1,4 +1,4 @@
-# Category: Differential Equations
+# Category: Chaos
 # Name: Strange Attractor (Duffing's equation)
 #
 # Creates a strange attractor by strobing the forced Duffing