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Removed support for Python 2.6, since NumPy removed support for it as of
version 1.12. Numpy-1.8.2 or later is now required.
Added more ufuncs: equal, not_equal, less, less_equal, greater, greater_equal
Bugs fixed
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https://github.com/python-quantities/python-quantities/issues?utf8=✓&q=is%3Aissue%20is%3Aclosed%20closed%3A2015-12-06..2017-08-01
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