Updated README to include testing procedure.
Updated README to include testing procedure.

posita/dropbox-sdk-python,dropbox/dropbox-sdk-python,leonardoo/dropbox-sdk-python,smarx/dropbox-sdk-python,ewjoachim/dropbox-sdk-python,mafrosis/dropbox-python-sdk,leonardoo/dropbox-sdk-python,mafrosis/dropbox-python-sdk,posita/dropbox-sdk-python,dropbox/dropbox-sdk-python,ewjoachim/dropbox-sdk-python,smarx/dropbox-sdk-python