Problem sets already alphabetized. Updating TODO.

DavidMetcalfe · DavidMetcalfe · commit d3614407687c · 2015-10-27T21:54:26.000-07:00
diff --git a/TODO.md b/TODO.md
@@ -30,4 +30,4 @@ TODO
     - [x] zh
     - [ ] javascript framework
     - [x] courses
-    - [ ] problem sets
+    - [x] problem sets
