Window move follows moved window

The behavior for this was changed in tmux 3.0
We're adding a flag to keep tmux 2.x behavior.

Thanks @kaykayehnn

Closes #30

Author: bruno-

CHANGELOG.md

@@ -3,6 +3,8 @@
 ### master
 - update readme - write all keybindings
 - override default split window key bindings
+- Moving windows follows current window, compensate for change in behavior in
+  tmux 3.0
 
 ### v1.0.0, 2014-08-30
 - update readme to reflect github organization change

pain_control.tmux

@@ -27,8 +27,8 @@ pane_navigation_bindings() {
 }
 
 window_move_bindings() {
-	tmux bind-key -r "<" swap-window -t -1
-	tmux bind-key -r ">" swap-window -t +1
+	tmux bind-key -r "<" swap-window -d -t -1
+	tmux bind-key -r ">" swap-window -d -t +1
 }
 
 pane_resizing_bindings() {