Add and update pkgs

src/leftwm/readme.install

@@ -0,0 +1,4 @@
+post_upgrade() {
+	echo -e "\n\e[1;33mWarning:\e[0m When upgrading from a build without \`lefthk\` (basically anything before \`0.4.0\`) you need to completely restart \`leftwm\` in order to start the hotkey daemon proprerly. A \`SoftReload\` or \`HardReload\` will leave you with a session non responsive to keybinds but otherwise running well."
+	echo -e "\n\e[1;33mPlease reboot or exit to login/tty to restart \`leftwm\`.\e[0m"
+}