Sphinx-gitref

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Bugfix:

* Fix documentation
* Fix trove classifiers

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Features:

* Add hash checking
* Add ``sphinx-gitref check`` command to check without building
* Add ``sphinx-gitref update`` to update the hash file

Changes:

* Invalid references are now rendered as text label only, without an invalid link url.

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Changes:

* Set ``parallel_read_safe=True``
* Expand documentation

Thanks to:

* Martijn Pieters (mjpieters) for the ``parallel_read_safe`` change (11)

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Features:

* Add project root override with ``gitref_relative_project_root``

Changes:

* Better project root detection with override support (fixes 12)
* Support latest Sphinx

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Changes

* Improve repository pattern matching

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Features:

* Add custom label formatting with ``gitref_label_format``

Changes:

* Fix bug when node target has no id
* Improve branch detection to support a recently detached ``HEAD``