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If you're shortening it at the lever end, you'll definitely need the bleed kit. You'll also need the adaptor to connect the fluid cup that fits onto the lever (Shimano part # Y0C698050 or equivalent) if one didn't come with your brake kit.
I disagree, shortening at the lever end is easy and often doesn't need bleeding, and at worse just needs a little burp with the cup, any air is right up at the top of the system so easy to get rid of that way.
If you're shortening it at the lever end, you'll definitely need the bleed kit. You'll also need the adaptor to connect the fluid cup that fits onto the lever (Shimano part # Y0C698050 or equivalent) if one didn't come with your brake kit.