Play-requests

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- Nothing changed yet.

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- Manages cookies and prepare them for you so you don't have to create cookie
headers by yourself using the ``auth=('username', 'password')``

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- Supports new pytest-play >= 2.0 YAML based syntax (json no more supported)

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- remove condition option (already implemented by pytest-play's ``skip_condition``)

- documentation improvements

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- Refactor internal methods

- Remove merge commands with default payload (already
implemented in ``pytest-play`` >= 1.1.0)

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* First release