tmux copy fix

After updating tmux to 2.4 I got the problem with vi-copy. The error message was: command not found: bind-key 🤔

This fixed it:

before:

bind-key -t vi-copy 'v' begin-selection
bind-key -t vi-copy 'V' begin-selection
bind-key -t vi-copy 'y' copy-pipe "pbcopy" # for OSX

now:

bind-key -Tcopy-mode-vi 'v' send -X begin-selection
bind-key -Tcopy-mode-vi 'V' send -X begin-selection
bind-key -Tcopy-mode-vi 'y' send -X copy-pipe "pbcopy" # for OSX

Cheers!