Macbook Port Covers USB HDMI Thunderbolt

This just adds Thunderbolt port covers to the great HDMI and USB port covers nicely designed by 2Bxki. I never use the Thunderbolt ports on my laptop, so I wanted to keep the dust out.

Original HDMI and USB ports: https://www.thingiverse.com/thing:952092

For some reason, my slicer has a difficult time with the small Thunderbolt model. It printed a bit different than designed. It's also not a perfect fit; needs a bit of a trim with the exacto knife to fit. But, now the ports on my Macbook a