docs: update developer's guide with 0.2 changes
docs: update developer's guide with 0.2 changes

michaelcho/python-devicecloud,michaelcho/python-devicecloud,brucetsao/python-devicecloud,digidotcom/python-devicecloud,digidotcom/python-devicecloud,ctrlaltdel/python-devicecloud,ctrlaltdel/python-devicecloud,brucetsao/python-devicecloud