Numba-kdtree

What's Changed
* Query functions return the number of valid neighbors as well by mortacious in https://github.com/mortacious/numba-kdtree/pull/9
* Add defintion of the ssize_t type on windows systems by mortacious in https://github.com/mortacious/numba-kdtree/pull/8
* Improved unit tests by mortacious in https://github.com/mortacious/numba-kdtree/pull/10


**Full Changelog**: https://github.com/mortacious/numba-kdtree/compare/v0.1.5...v0.1.6

- removed numpy build dependency
- fixed crashes on interpreter shutdown

- added support for `numba.typed.List` inputs

- added automatic conversion to list arguments.
- moved `n_jobs` switch to python code. This results in faster compilation time for `query` and `query_radius`.