Coinbasepro

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**Improvements**

- Added rate-limiting to all public and authenticated endpoints. Dropping support for Python 3.4 to keep the implementation simple.

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**Bugfixes**

- Parameters used for historic rates (start/end) were not being sent in query parameters (thanks imalovitsa-exos!).

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**Improvements**

- Return values are now Pythonic types (i.e Decimal, datetime) instead of all string types.
- Python3 typing now used to help with development using this API.
- Docstring improvements and changes to match updated interface.
- A bit more documentation in the readme.

**Bugfixes**

- Update requests version to >=2.20.0 to address security vulnerability.

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**Bugfixes**

- Fix parameter name for `get_product_historic_rates`.

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**Improvements**

- Update parameter validation for `get_fills` to reflect Coinbase API change.

**Bugfixes**

- Fixed bug where parameters had no effect in `get_product_historic_rates`.
- Fixed bug where `product_id` parameter had no effect in `cancel_all`.

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**Improvements**

- Add exceptions for Coinbase error responses.