Requests-hawk

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- Add support for ext external data string (34)
(thanks jtmaclachlan)

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- Nothing changed yet.

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- Handle cases where Content-Type is defined as bytes rather than string. (25)
- Allow for app mohawk sender parameter configuration

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- Allow to skip hashing request and response bodies with `always_hash_content`.

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- Add Python 3 support. (22)

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- Simplified API for using HawkAuth when the id and key are known. (8)
- Added support for overriding the default algorithm (sha256) when deriving
credentials from the hawk session token, via a new ``algorithm`` parameter.

See the README for migration advice if you use the ``credentials`` parameter.