2.2.1
- Fix: date_query type had fields incorrectly marked as mandatory
- Added customer field to Source entity
- Added deleted property to resources that can be deleted
- Added some missing attributes to update endpoints for SKU, Charge, TransferReversal, Transfer
- Added API version compatibility table to README.md
- Bumped supported API version to 2018-08-23
- Updated stripe-mock dependency to 0.30.0
- Fixed formatting in README.md