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* Remove py2 and py3<3.5 support, minimum requirement is Python 3.5 now.
If you are stuck on Python 2.x or < 3.5, use llfuse<1.4.0.
* setup.py: return rc=2 in error cases, fixes 52.
implements same behaviour as pyfuse3 for these cases.
* Use EACCES instead of EPERM for file permission errors, fixes 36.
* Fix long-standing rounding error in file date handling when the nanosecond
part of file dates were > 999999500, fixes 38.
* Docs: add link to pyfuse3 porting hints ticket
* Testing:
- Add Power support (ppc64le) to travis CI.
- Move CI to GitHub Actions, except ppc64le.
- Test fixes for pytest 6.