Issue #6 - Python 3.10 support, bug fixes, and refactoring #7
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Fixes Issue: #6
Added support for python 3.9 and 3.10. Fixed problems where the USPS api would reject results due to the ordering of the data sent to it. Refactored ServiceDelivery.make_xml to not take in a redundant user id. Moved the user id to the environment variables to make it easier to configure and remove the possibility of accidentally committing it to a repo. Reformatted file and imports. Added requirements to the setup and created a requirements.txt file to make it easier to setup. Fixed a problem where errors would not unescape the text so it could contain unreadable content. Added virtual environment paths and files to the git ignore.