pgindent README correction

I found that I needed to adjust the command given in the README file
for pgindent.  Trivial patch attached.
 
The one other issue I ran into in following the latest pgindent
instructions was that I had to add #include <stdlib.h> to the
parse.c file (as included in the pg_bsd_indent-1.1.tar.gz file at
ftp://ftp.postgresql.org/pub/dev ).  Without it I got this:
 
parse.c: In function *parse*:
parse.c:236:6: warning: implicit declaration of function *exit*
parse.c:236:6: warning: incompatible implicit declaration of built-in
function *exit*
 
Can someone fix that and put up a 1.2 version?
 
-Kevin