v6.6.2 is released

This release includes a number of minor fixes that came up because of increasing our test coverage.

• Nearly 100% test coverage for Python
• Pickling and unpickling models is now compatible with latest scikit-learn
• Fixed subtle pathing issues for locating the jar

Thanks to @WardLT for finding a issue with model pickling and submitting a fix!

Full Changelog: v6.6.1...v6.6.2