Add pykb hook to update i3status after changing keyboard layout

dotfiles/config/bmo/hook.ini

 [hook.be]
     post = killall -SIGUSR1 i3status
 
+[hook.pykb]
+    post = killall -SIGUSR1 i3status
+
 [hook.kb]
     post = killall -SIGUSR1 i3status