Fritzing file for prototyping shield
A quick google search turned up a solution in the very first result:

https://forums.adafruit.com/viewtopic.php?f=31&amp;t=36560

It is a contribution from an Adafruit customer. 
All credits go to them.

Source thread: https://forums.adafruit.com/viewtopic.php?f=31&amp;t=36560