patch: add xvfb to dependencies

Author: Tbusk

README.md

@@ -38,13 +38,13 @@ Monitor will be available from the Applications menu.
 If you plan to install WITH a wingpanel-indicator
 
 ```bash
-sudo apt install build-essential cmake sassc valac libgtk-3-dev libgee-0.8-dev libgranite-dev libgtop2-dev libhandy-1-dev libudisks2-dev libjson-glib-dev libflatpak-dev libxnvctrl-dev liblivechart-1-dev libpci-dev libwingpanel-dev meson
+sudo apt install build-essential cmake sassc valac libgtk-3-dev libgee-0.8-dev libgranite-dev libgtop2-dev libhandy-1-dev libudisks2-dev libjson-glib-dev libflatpak-dev libxnvctrl-dev liblivechart-1-dev libpci-dev libwingpanel-dev meson xvfb
 ```
 
 Alternatively, if you plan to install WITHOUT a wingpanel-indicator
 
 ```bash
-sudo apt install build-essential cmake sassc valac libgtk-3-dev libgee-0.8-dev libgranite-dev libgtop2-dev libhandy-1-dev libudisks2-dev libjson-glib-dev libflatpak-dev libxnvctrl-dev liblivechart-1-dev libpci-dev meson
+sudo apt install build-essential cmake sassc valac libgtk-3-dev libgee-0.8-dev libgranite-dev libgtop2-dev libhandy-1-dev libudisks2-dev libjson-glib-dev libflatpak-dev libxnvctrl-dev liblivechart-1-dev libpci-dev meson xvfb
 ```