Pycgdescent

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**Dependencies**

* Bump minimum version to Python 3.8.

**Features**

* Use ``black`` for formatting.

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**Dependencies**

* Advertise support for Python 3.10.

**Features**

* Support Numpy 1.22 type annotations.

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**Fixes**

* Fix an uninitialized variable in the original CG_DESCENT sources.

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**Fixes**

* Fix version bump.

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**Features**

* Add a very sketchy patch to limit the maximum step size in the algorithm.
* Add type checking everywhere.

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**Features**

* Initial release!
* A wrapper around the `CG_DESCENT <https://people.clas.ufl.edu/hager/software/>`__
using `pybind11 <https://github.com/pybind/pybind11>`__.
* Added convenience APIs to bring it closer to
`scipy.optimize.minimize <https://docs.scipy.org/doc/scipy/reference/generated/scipy.optimize.minimize.html>`__
(although not a drop in replacement at the moment).