don't use beep twice, confusing

Author: James Halliday

readme.markdown

@@ -21,8 +21,8 @@ console.log(argv);
 Contexts are denoted with square brackets:
 
 ```
-$ node example/show.js beep --beep [ boop -a 3 ] -n4 --robots [ -x 8 -y 6 ]
-{ _: [ 'beep' ],
+$ node example/show.js rawr --beep [ boop -a 3 ] -n4 --robots [ -x 8 -y 6 ]
+{ _: [ 'rawr' ],
   beep: { _: [ 'boop' ], a: 3 },
   n: 4,
   robots: { _: [], x: 8, y: 6 } }