version 0.6.2: Bug fix when ordering date restricted products

v0.6.1: Bug fix, espa order sometimes contained a forbidden additiona…

…l property

v0.6.0: Drop support for python 2

version 0.5.2: Added error handling in download method

version 0.5.1: Bug fix for when conf file is in non standard location

version 0.5.0: New option to unpack data on download

version 0.4.3: Bug fix in download method

version 0.4.2: Bug fix in download function

version 0.4.1: Bug fix exception when improper configuration

version 0.4.0: python 2 support