Pi2Jamma Raspberry Pi mount

**Update 4/23/2019**: Added a "3 hole" model that only has 3 support columns, as I found that one of the support columns was blocking 2 of the USB ports on the Raspberry Pi if you need to use them.

This is a modification of the available Pi2Jamma Raspberry Pi mount available to correct/change a few things:

* Reduce height of Pi2Jamma support columns by 5.5mm to allow it to plug in correctly to Raspberry Pi 3 B+
* Move support columns to align with holes on Pi2Jamma v0.2c board
* Add 2 support columns to match 4 holes on Pi2Jamma board
* Adjust column hole size to screw in directly and remove nut holes from bottom of mount, as they are no longer needed and allows for cleaner prints

I used four M3-.50 x 8 and four M3-.50 x 5 screws to mount the boards to this.

I do not know the author of the original STL file I modified and it is not available on Thingiverse to give credit. I'll update this if I find out.