Name already in use

Co-authored-by: Clemens Wolff <clemens@justamouse.com>

* Migrate from Travis to Github Actions

Co-authored-by: Matthew Peveler <matt.peveler@gmail.com>

* Fix install on MacOS with Python 2.7

* Exclude setup.py from code coverage

* Fix periodic build breaks on Windows

* Drop Python 3.8 as we don't have a wheel for it

* Add support for Python 3.8

* Update mirror URL

* Different filename for Python 3.8 wheel

* Update azure-pipelines.yml

* Update azure-pipelines.yml

Co-authored-by: Matthew Peveler <matt.peveler@gmail.com>

rdflib 5.0.0 reworked some amount of their interface, which breaks things here. Minimally, SPARQLWrapper is no longer used,
and a requests based wrapper internal to rdflib is now used, which breaks compatibility with older RDF stores that do not follow
the SPARQL Protocol 1.1 spec. Setting this to minimize the break here, with a look to move to rdflib 5 in the next major version
bump of gutenberg itself.

Signed-off-by: Matthew Peveler <matt.peveler@gmail.com>

Release v0.8.0

* Parameterize OS image

* Add MacOS CI

* Fix install on Python 2.7 on MacOS

Drop support for EOL Python 3.4

* Set up CI with Azure Pipelines

* Fix json loading

* Fix reopen_encoded test

* Sync classifiers with Python versions from CI

* Remove Python 3.4 since no bsddb3 wheel exists

* Add build badge

* Sync README with Python versions from CI

Libdb5.1-dev is not available for Ubuntu 16.04. libdb++-dev works in its place for this project.

Reflect tooling changes in README

Instead of nose, we're now using nose2. Also: mention possibility to run
the project via Docker.

Move from coveralls to codecov

The Travis logs show that the coveralls repo seems to have disappeared
(error: "Couldn't find a repository matching this job.") so this changes
is moving the project from coveralls to codecov.