Django-cid

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- Nothing changed yet.

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- Under Python 3.7 and later, use context variables (with the contextvars module)
instead of a thread-local variable to avoid state bleeding in concurrent code.

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- Add support of Django 3.1.

- Remove support of Python 3.5.

- :strike:`Under Python 3.7 and later, use context variables (with the contextvars module) instead of a thread-local variable to avoid state bleeding in concurrent code.` Version 2.2 had a bug that caused context variables to never be used. Thread-local variables were always used.

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* Add support of Django 3.0
* |backward-incompatible| Drop support of Django 2.1.

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* |backward-incompatible| Drop support of Python 3.4.
* |backward-incompatible| Drop support of Django 1.11 and Django 2.0.
* Add ``CID_GENERATOR`` setting to allow the customization of the
correlation id.

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- **bugfix**: Fix packaging bug (introduced in version 1.2) that
caused two extra packages ``tests`` and ``sandbox`` to be installed.