Modern-shippo

**Dependency Version Bumps**

- Allow requests version to be higher (2.27.1)

Release History
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**New features**

- Added support for Pickup and Order Objects
- Converted testing to CircleCi

Release History
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**Dependency Version Bumps**

- Allow simplejson version to be higher (3.17.2)
- Allow requests version to be higher (2.24.0)

Release History
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**Improvements**

- Add Webhook Class
- Add multi-piece shipment & webhook examples

Release History
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**Behavioural Changes**

- Update default API version to 2018-02-08. For more information on versioning and upgrading your version, please refer to https://goshippo.com/docs/versioning