Dugong

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* Now compatible with py.test 3.3

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* Now compatible with Python 3.6.

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* Dugong now supports server responses that specify just ``Connection:
close`` instead of providing the response length or using chunked
encoding.

* Dugong now honors the `~ssl.SSLContext.check_hostname` attribute of
`~ssl.SSLContext` objects.

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* Dugong now uses semantic versioning. This means that
backwards-incompatible versions (i.e., versions that change the
existing API in some way) will be reflected in an increase of the
major version number, i.e. the next backwards-incompatible version
will have version 4.0.

* Various minor bugfixes.

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* The `is_temp_network_error` function now knows about more kinds of
temporary errors, in particular also about those that do not have a
corresponding Python exception (e.g. no route to host).

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* The :file:`examples/extract_links.py` script is now Python 3.3
compatible again.

* Dugong now has proper proxy support for plain HTTP
connections. Thanks to Vincent Bernat for the patch.

* Dugong now raises `DNSUnavailable` or `HostnameNotResolvable`
exceptions instead of the more generic `socket.gaierror` and
`socket.herror` exceptions where possible.