weechat: update wee-slack

diff --git a/weechat/python/wee-slack b/weechat/python/wee-slack
index c303a77c5420f2f97306802953d57a9587ba5fd6..869c81eb79345f1da7b9ae91ad9fc8dc009603d1 160000 (submodule)
--- a/weechat/python/wee-slack
+++ b/weechat/python/wee-slack
@@ -1 +1 @@
-Subproject commit c303a77c5420f2f97306802953d57a9587ba5fd6
+Subproject commit 869c81eb79345f1da7b9ae91ad9fc8dc009603d1