[hackers] [libzahl] update todo || Mattias Andrée

[git]

commit 7ad81d682ee7957bb87889e24138c37ed16db3d9
Author:     Mattias Andrée <maand...@kth.se>
AuthorDate: Wed Jun 22 20:29:31 2016 +0200
Commit:     Mattias Andrée <maand...@kth.se>
CommitDate: Wed Jun 22 20:29:31 2016 +0200

    update todo
    
    Signed-off-by: Mattias Andrée <maand...@kth.se>

diff --git a/TODO b/TODO
index 5fe23fa..44af9a2 100644
--- a/TODO
+++ b/TODO
@@ -44,3 +44,6 @@ Add CPU-warmup loop to benchmarks.
 benchmark with worst case, average case, and best case input.
 
 zadd, zsub: benchmark both dense and sparse integers.
+
+Feedback on error handling:
+        http://bbs.progrider.org/prog/read/1457215529/31,47