swaybar: terminate status_command process
swaybar: terminate status_command process

Fix #346

Send SIGTERM to the `status_command` process before swaybar exits.

1ace/sway,sleep-walker/sway,crondog/sway,ascent12/sway,SirCmpwn/sway,ptMuta/sway,crondog/sway,ascent12/sway,mikkeloscar/sway,4e554c4c/sway,ascent12/sway,1ace/sway,taiyu-len/sway,mikkeloscar/sway,taiyu-len/sway,colemickens/sway,colemickens/sway,sleep-walker/sway,1ace/sway,taiyu-len/sway,johalun/sway,4e554c4c/sway,colemickens/sway