Updated version to 1.6 #761

Job	Run time
android-sdl	6m 17s
ios-sdl	3m 42s
ios-sfml-graphics	55s
android-sfml-graphics	2m 51s
linux	5m 4s
linux-latest-dev	5m 0s
linux-oldest	3m 6s
linux-per-backend	5m 29s
macos	2m 19s
windows	2m 15s
windows-clang	4m 52s
windows-oldest	6m 50s
windows-static-mt	6m 1s
nightly-build-windows-visual-studio	6m 49s
	1h 1m 30s

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