docs: add xclip to required debian packages

xclip is required for the clipboard functionality to work.

Author: replydev

README.md

@@ -90,7 +90,7 @@ Before beginning check that you have the required build dependencies to use the
 
 You need to install the **libxcb-devel** dependency, needed for clipboard coping in X11:
 
-- Debian based: `sudo apt install libxcb1-dev libx11-dev libxcb-shape0-dev libxcb-xfixes0-dev libxkbcommon-dev`
+- Debian based: `sudo apt install libxcb1-dev libx11-dev libxcb-shape0-dev libxcb-xfixes0-dev libxkbcommon-dev xclip`
 - Fedora / RHEL based: `sudo dnf install libX11-devel`
 - Void Linux `sudo xbps-install -S libxcb-devel`