fix(api)

[ThugPigeon653]

I have made encoding (in client) compatible with both Python 2 and Python 3. The existing encoding was the correct approach for Py2, but was not appropriate for python3, because it had removed the data type. So as to not cause any issues with the python3 interpreter, urlencode_params() checks for a str type instead of unicode. Python3 shouldn't really need encoding here, but unlike 2, it will handle unnecessary encoding fine - so I have enforced it to always encode for python3

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Fixes #<issue_number_goes_here> 🦕