If you have printed a pattern, you can see the Revision number at the very bottom. It starts with 'C' for crew neck or 'S' for saddle shoulder.
The new Revision number for the Crew Neck pattern is 1.02, dated 8/30/19. The Saddle Shoulder got a later update: S 1.03 09-10-19. If you have printed a pattern but have not started working it yet, I suggest you download the pattern and print it again.