Update version to 1.6

Author: phoboslab

Quake/quakedef.h

@@ -37,7 +37,7 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 #define	FITZQUAKE_VERSION	0.85	//johnfitz
 #define	QUAKESPASM_VERSION	0.9
 #define	QUAKESPASM_VER_PATCH	9	// helper to print a string like 0.85.9
-#define	RIFTQUAKE_VERSION	1.5
+#define	RIFTQUAKE_VERSION	1.6
 
 //define	PARANOID			// speed sapping error checking