updated for version 7.4.592

Problem:    When doing ":e foobar" when already editing "foobar" and 'buftype'
            is "nofile" the buffer is cleared. (Xavier de Gaye)
Solution:   Do no clear the buffer.

src/version.c

@@ -741,6 +741,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    592,
 /**/
     591,
 /**/