Removed Pycom reference (#675)

UInfortunately Pycom is no longer a thing, removed from the platforms list.

Author: andypiper

README.md

@@ -112,7 +112,6 @@ of the user manual.
 1. `MaixPy` https://github.com/sipeed/MaixPy
 1. `OpenMV` https://github.com/openmv/openmv
 1. `pimoroni-pico` https://github.com/pimoroni/pimoroni-pico
-3. `pycom` https://pycom.io/
 
 ## Compiling