Deep Sleep Shield Update

[bucknall]

@ssmith You can find the schematic on the docs - https://docs.pycom.io/chapter/datasheets/downloads/deepsleep-schematic.pdf

We'll be posting a pinout document (which is more clear) soon!

Thanks!

[ssmith]

Could you publish a list of pins used by this shield? I use several GPIO pins in my design and would appreciate a reference doc to know if there are any conflicts.