remove unnecessary ExecStop as systemd does it automatically

release/config/systemd/v2ray.service

@@ -7,7 +7,6 @@ Wants=network.target
 Type=simple
 PIDFile=/var/run/v2ray.pid
 ExecStart=/usr/bin/v2ray/v2ray -config /etc/v2ray/config.json
-ExecStop=kill $(cat /var/run/v2ray.pid)
 Restart=on-abnormal
 
 [Install]