add visual and yank to vi copy mode

.tmux.conf

@@ -12,6 +12,8 @@ bind s choose-tree -sZ -O name
 setw -g mode-keys vi
 bind / copy-mode \; send-key /
 bind ? copy-mode \; send-key ?
+bind -Tcopy-mode-vi 'v' send -X begin-selection
+bind -Tcopy-mode-vi 'y' send -X copy-pipe-and-cancel pbcopy
 
 bind r source-file ~/.tmux.conf \; display '~/.tmux.conf sourced'