- Update to 1.4.1:
 
 * Restore use of calendar-specific sub-classes in `cftime.num2date`,
   `cftime.datetime.__add__`, and `cftime.datetime.__sub__`.  The use of them 
   will be removed in a later release.
 * add 'fromordinal' static method to create a cftime.datetime instance
   from a julian day ordinal and calendar (inverse of 'toordinal').
 * `cftime.date2num` will now always return an array of integers, if the units
   and times allow.  Previously this would only be true if the units were
   'microseconds' (PR #225).  In other circumstances, as before, `cftime.date2num`
   will return an array of floats.
 * Rewrite of julian day/calendar functions (_IntJulianDayToCalendar and 
   _IntJulianDayFromCalendar) to remove GPL'ed code.  cftime license
   changed to MIT (to be consistent with netcdf4-python). 
 * Added datetime.toordinal() (returns julian day, kwarg 'fractional'
   can be used to include fractional day).
 * cftime.datetime no longer uses calendar-specific sub-classes.
 * fix for issue #211 (PR #212) bug in masked array handling in date2num)
 * switch from travis/appveyor to github actions for CI/CD (PR #215).
 * switch to cython language_level=3 (no more support for python 2) (PR #217).
 * add __init__.py to test dir so pytest coverage works again. Add Coveralls
   step to github actions workflow to upload coverage data to coveralls.io (PR
   #217).
 * move package under 'src' directory so cftime can be imported
   from install dir (PR #218 - see
   https://blog.ionelmc.ro/2014/05/25/python-packaging/#the-structure).
 * zero pad years in strtime (issue #194)
 * have cftime.datetime constuctor create 'calendar-aware' instances (default is
   'standard' calendar, if calendar='' or None the instance is not calendar aware and some
   methods, like dayofwk, dayofyr, __add__ and __sub__, will not work). Fixes issue #198.
   The calendar specific sub-classes are now deprecated, but remain for now
   as stubs that just instantiate the base class and override __repr__.
 * update regex in _cpdef _parse_date so reference years with more than four
   digits can be handled. 
 * Change default calendar in cftime.date2num from 'standard' to None
   (calendar associated with first input datetime object is used).
 * add `cftime.datetime.tzinfo=None` for compatibility with python datetime
   (issue #208).
 * num2date uses 'proleptic_gregorian' scheme when basedate is post-Gregorian but date is pre-Gregorian
   (issue #182).
 * fix 1.2.0 regression (date2num no longer works with numpy scalar array inputs, issue #185).
 * Fix for issue #187 (have date2num round to the nearest second when within 1
   microsecond).
 * Fix for issue #189 (leap years calculated incorrectly for negative years in
   proleptic_gregorian calendar).
- No longer build for Python 3.6, due to no NumPy.
- Correct license file name.

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