add missing dependency

Author: schorschii

installer/debian/jabber4linux/DEBIAN/control

@@ -3,6 +3,6 @@ Version: 0.4
 Section: base
 Priority: optional
 Architecture: all
-Depends: python3, python3-requests, python3-dnspython, python3-pyqt5, portaudio19-dev, python3-watchdog, python3-cryptography (>=2.5), python3-pip
+Depends: python3, python3-requests, python3-dnspython, python3-pyqt5, portaudio19-dev, python3-watchdog, python3-cryptography (>=2.5), python3-filelock, python3-pip
 Maintainer: Georg Sieber <it@georg-sieber.de>
 Description: Unofficial Cisco Jabber implementation for Linux (https://github.com/schorschii/jabber4linux)