README: Wine no longer supports Mac OS X 10.4

[Austin English]

http://bugs.winehq.org/show_bug.cgi?id=31492#c6

-- 
-Austin
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diff --git a/README b/README
index 2b3e38f..783e798 100644
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@@ -32,7 +32,7 @@ To compile and run Wine, you must have one of the following:
   FreeBSD 7.0 or later
   Solaris x86 9 or later
   NetBSD-current
-  Mac OS X 10.4 or later
+  Mac OS X 10.5 or later
 
 As Wine requires kernel-level thread support to run, only the operating
 systems mentioned above are supported.  Other operating systems which