Uber-rides

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- Added SDK Version header

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- Added Pool support

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- Fixed backwards compatibility setup support for Python 2
- Allowed custom state tokens for authorizations
- Improved ErrorDetails formatting

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- Added support for Python 3

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- Added places support
- Added payment methods support
- Added trip experiences support
- Added optional destination (Fix for Issue 4)
- Added update destinaion support
- Added default product ID support for estimates and ride requests
- Rides Client mode (Sandbox or Production) is explicitly set

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- Initial version.