python-dfdatetime-0~20200121-bp152.1.2

- update to v0~20200121
  * mandatory for python-dfVFS v0~20200211 support
  * the changelog does not show what change makes this mandatory

- Convert to python3 only

- update to v0~20190517
  * changelog not provided
- Added Requires: python-mock  to allow self-test to be manually run

- update to v0~20180110
  * deprecated a functions
  * added new functions

- update to v0~20170719
  * various improvements including
  new format support
  added sanity checks
- implement python singlespec syntax
- remove the lines that delete *.pyc and *.pyo files,
  they no longer cause problems

- Use python macros for filelists.
  Use hardlinks for fdupes, it's cheaper.

- initial package v0~20160323