Support stripe-python 2.0

[blueyed]

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[codecov]

Codecov Report

Merging #574 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #574      +/-   ##
==========================================
- Coverage   99.21%   99.21%   -0.01%     
==========================================
  Files          33       33              
  Lines        1917     1911       -6     
  Branches      175      175              
==========================================
- Hits         1902     1896       -6     
  Misses          7        7              
  Partials        8        8

Flag	Coverage Δ
#py27dj110	98.9% <100%> (-0.01%)	⬇️
#py27dj111	98.9% <100%> (-0.01%)	⬇️
#py27dj18	99.16% <100%> (-0.01%)	⬇️
#py34dj110	98.9% <100%> (-0.01%)	⬇️
#py34dj111	98.9% <100%> (-0.01%)	⬇️
#py34dj18	99.16% <100%> (-0.01%)	⬇️
#py34dj20	98.9% <100%> (-0.01%)	⬇️
#py35dj110	98.9% <100%> (-0.01%)	⬇️
#py35dj111	98.9% <100%> (-0.01%)	⬇️
#py35dj18	99.16% <100%> (-0.01%)	⬇️
#py35dj20	98.9% <100%> (-0.01%)	⬇️
#py36dj111	98.9% <100%> (-0.01%)	⬇️
#py36dj20	98.9% <100%> (-0.01%)	⬇️
#py36dj20psql	98.9% <100%> (-0.01%)	⬇️

Impacted Files	Coverage Δ
pinax/stripe/actions/coupons.py	100% <100%> (ø)	⬆️
pinax/stripe/actions/plans.py	100% <100%> (ø)	⬆️
pinax/stripe/actions/invoices.py	100% <100%> (ø)	⬆️
pinax/stripe/webhooks.py	99.07% <100%> (ø)	⬆️
pinax/stripe/actions/customers.py	100% <100%> (ø)	⬆️
pinax/stripe/views.py	100% <100%> (ø)	⬆️

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