Paradex v2 update

[grandizzy]

All tests works OK but retrieving balances with new API returns no value, in discussions with Paradex to clarify this issue

[codecov-io]

Codecov Report

Merging #39 into master will decrease coverage by <.01%.
The diff coverage is 0%.

@@            Coverage Diff            @@
##           master     #39      +/-   ##
=========================================
- Coverage    5.85%   5.85%   -0.01%     
=========================================
  Files          25      25              
  Lines        2936    2940       +4     
=========================================
  Hits          172     172              
- Misses       2764    2768       +4

Impacted Files	Coverage Δ
pyexchange/paradex.py	0% <0%> (ø)	⬆️

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