Hankel

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**Deprecations**

- The ``.G()`` has been removed as planned.

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**Maintenance**

- Switched to using ``setup.cfg`` instead of ``setup.py`` and various other tooling updates.

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**Enhancements**

- Add ability to perform hankel transforms on complex functions.

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**Enhancements**

- Limit calculation for k=0 provided (resulted in nan before)
- Alternative hankel kernel now selectable: sqrt(x) * J(nu, x)
- Caching of series factors for faster calculations
- Various infrastructure upgrades (setuptools_scm, pre-commit, black)

**Bugfixes**

- Saver calculation of xrange_approx

**Deprecations**

- Methods ``G`` and ``deltaG`` now named ``final_term_amplitude`` and ``slope_of_last_term``.

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Version corresponding to JOSS paper release.

**Bugfixes**

- Fixed SymmetricFourierTransform default N to be dynamic, like HankelTransform.

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**Enhancements**

- Swapped to pytest from nose for all testing
- Removed warnings of overflow for cosh and sinh functions
- Improved documentation in many areas.
- Swapped out default 3.2/h for pi/h, which sounds way cooler :-)

**Bugfixes**

- Fixed an error in tests such that the wrong analytic function was being tested.
- Removed a check for deltaG in get_h, which sometimes fails spectacularly.