add XFree(info), simplify README.md

README.md

@@ -7,8 +7,7 @@
 XMenu is a menu utility for X.
 XMenu receives a menu specification in stdin, shows a menu for the user
 to select one of the options, and outputs the option selected to stdout.
-XMenu can be controlled both via mouse and via keyboard.  The menu is a
-pop-up menu (that is, after selecting an option, the menu disappears).
+XMenu can be controlled both via mouse and via keyboard.
 
 In order to generate a menu of applications based on .desktop entries,
 as specified by XDG, checkout [xdg-xmenu](https://github.com/OliverLew/xdg-xmenu)

xmenu.c

@@ -316,6 +316,8 @@ initmonitor(void)
 		mon.y = info[selmon].y_org;
 		mon.w = info[selmon].width;
 		mon.h = info[selmon].height;
+
+		XFree(info);
 	}
 
 	if (!pflag) {