[libretro] Update info file

Author: drhelius

platforms/libretro/geargrafx_libretro.info

@@ -6,7 +6,7 @@ corename = "Geargrafx"
 categories = "Emulator"
 license = "GPLv3"
 permissions = ""
-display_version = "1.5.0"
+display_version = "1.6.0"
 
 # Hardware Information
 manufacturer = "NEC"