update package dependency for ubuntu

README.md

@@ -11,7 +11,7 @@ sudo pacman -S extra-cmake-modules pkgconf qt5-base qt5-quickcontrols2 qt5-x11ex
 For Ubuntu:
 ```shell
 sudo apt install libpolkit-agent-1-dev libpolkit-qt5-1-dev libpulse-dev libsm-dev libxtst-dev\
-    libxcb-randr0-dev libxcb-shape0-dev libxcb-xfixes0-dev libxcb-composite0-dev libxcb-damage0-dev
+    libxcb-randr0-dev libxcb-shape0-dev libxcb-xfixes0-dev libxcb-composite0-dev libxcb-damage0-dev libxcb-image0-dev libxcb-util0-dev
 ```
 (Yes it's annoying that so many xcb's packages here is needed to install. Isn't there a way to install one package and these `libxcb`s all get ready?)