* Plotting module no longer imported from init.py
* Removed slice_ellipsoid and slice_contour from hist module
* Remove CHANGES.md.
* Throw error if values are one-dimensional when creating multidimensional-dimensional histogram.
* Fixed bug in psdist.cov.normalization matrix when scale=True.
* Fix cov.normalization matrix and cov.intrinsic_emittances for 2D matrices
**Full Changelog**: https://github.com/austin-hoover/psdist/compare/v2.1.0...v2.1.4