Add --reverse option (top-to-bottom layout)

README.md

@@ -79,6 +79,7 @@ usage: fzf [options]
     +c, --no-color       Disable colors
     +2, --no-256         Disable 256-color
         --black          Use black background
+        --reverse        Reverse orientation
 
   Scripting
     -q, --query=STR      Start the finder with the given query