Log Message:
py-decorator: updated to 4.3.2

4.3.2:
Accepted a patch from Sylvain Marie (https://github.com/smarie): now the
decorator module can decorate generator functions by preserving their
being generator functions. Set `python_requires='>=2.6, !=3.0.*, !=3.1.*'`
in setup.py, as suggested by https://github.com/hugovk.

4.3.1:
Added a section "For the impatient" to the README, addressing an issue
raised by Amir Malekpour. Added support for Python 3.7. Now
the path to the decorator module appears in the tracebacks, as suggested
by an user at EuroPython 2018.