tagged/signed release 1.4.1

tagged/signed 1.4.0

add tag for release 1.4.0

tag / sign release release-1.3.8

some updates for release process, docs, testing (python-llfuse#26)

* setup.cfg: use default format for sdist (.tar.gz), see python-llfuse#25

* we need a very recent cython to support python 3.9

there were some incompatible changes in python 3.9,
thus code generated by old cython versions won't compile.

* fix typo in changelog

it still worked for py38, but py39 was broken because they
removed some deprecated stuff still present in the old
cython-generated C code.

* travis: testing on all python versions

also: on differently old linux dists

* pypi metadata: be more precise about python versions

Note: I used the same python versions as for borgbackup because I run
extensive release testing for these versions (which indirectly tests
llfuse also) plus python 3.9 which should also work after fixing llfuse's
cythonized code for it.

There might be a need to drop 3.4 and 3.5 later again because they
are EOL, but for right now, they're still working and tested.

* disable developer mode on travis-ci

Tagged release.

Released 1.3.5

Released 1.3.4

Released 1.3.3