Support stripe-python 2.0

[blueyed]

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[codecov]

Codecov Report

Merging #117 into next will decrease coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##             next     #117      +/-   ##
==========================================
- Coverage   98.78%   98.77%   -0.01%     
==========================================
  Files          33       33              
  Lines        1971     1965       -6     
  Branches      180      180              
==========================================
- Hits         1947     1941       -6     
  Misses         14       14              
  Partials       10       10

Flag	Coverage Δ
#py27dj111	98.77% <100%> (-0.01%)	⬇️
#py36dj20psql	98.77% <100%> (-0.01%)	⬇️

Impacted Files	Coverage Δ
pinax/stripe/actions/invoices.py	100% <100%> (ø)	⬆️
pinax/stripe/actions/plans.py	100% <100%> (ø)	⬆️
pinax/stripe/actions/coupons.py	100% <100%> (ø)	⬆️
pinax/stripe/views.py	100% <100%> (ø)	⬆️
pinax/stripe/webhooks.py	99.09% <100%> (ø)	⬆️
pinax/stripe/actions/customers.py	100% <100%> (ø)	⬆️

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