Prawcore

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**Added**

- Add ``session`` parameter to Requestor to ease support of custom sessions (e.g.
caching or mock ones).

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**Added**

- Handle 413 Request entity too large responses.
- ``reset_timestamp`` to ``RateLimiter``.

**Fixed**

- Avoid modifying passed in ``data`` and ``params`` to ``Session.request``.

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**Added**

``ChunkedEncodingError`` is automatically retried like the server errors.

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**Added**

- Handle 500 responses.
- Handle Cloudflare 520 responses.

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**Added**

All network requests now have a 16 second timeout by default. The environment variable
``prawcore_timeout`` can be used to adjust the value.

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**Changed**

- Prevent '(None)' from appearing in OAuthException message.