Rdflib

Minor release to add OWL.rational & OWL.real which are needed to allow the OWL-RL package to use only rdflib namespaces, not it's own versions.

* Add owl:rational and owl:real to match standard.
[PR 1428](https://github.com/RDFLib/rdflib/pull/1428)

A few other small things have been added, see the following merged PRs list:

* rename arg LOVE to ns in rdfpipe
[PR 1426](https://github.com/RDFLib/rdflib/pull/1426)
* Remove Tox reference to Python 3.6
[PR 1422](https://github.com/RDFLib/rdflib/pull/1422)
* Add Brick DefinedNamespace
[PR 1419](https://github.com/RDFLib/rdflib/pull/1419)
* Use setName on TokenConverter to set the name property
[PR 1409](https://github.com/RDFLib/rdflib/pull/1409)
* Add test for adding JSON-LD to guess_format()
[PR 1408](https://github.com/RDFLib/rdflib/pull/1408)
* Fix mypy type errors and add mypy to .drone.yml
[PR 1407](https://github.com/RDFLib/rdflib/pull/1407)

Minor release to fix a few small errors, in particular with JSON-LD parsing & serializing integration from rdflib-jsonld. Also, a few other niceties, such as allowing graph `add()`, `remove()` etc. to be chainable.

* Add test for adding JSON-LD to guess_format()
[PR 1408](https://github.com/RDFLib/rdflib/pull/1408)
* Add JSON-LD to guess_format()
[PR 1403](https://github.com/RDFLib/rdflib/pull/1403)
* add dateTimeStamp, fundamental & constraining facets, 7-prop data model
[PR 1399](https://github.com/RDFLib/rdflib/pull/1399)
* fix: remove log message on import
[PR 1398](https://github.com/RDFLib/rdflib/pull/1398)
* Make graph and other methods chainable
[PR 1394](https://github.com/RDFLib/rdflib/pull/1394)
* fix: use correct name for json-ld
[PR 1388](https://github.com/RDFLib/rdflib/pull/1388)
* Allowing Container Membership Properties in RDF namespace (873)
[PR 1386](https://github.com/RDFLib/rdflib/pull/1386)
* Update intro_to_sparql.rst
[PR 1386](https://github.com/RDFLib/rdflib/pull/1384)
* Iterate over dataset return quads
[PR 1382](https://github.com/RDFLib/rdflib/pull/1382)

6.0.0 is a major stable release that drops support for Python 2 and Python 3 < 3.7. Type hinting is now present in much
of the toolkit as a result.

It includes the formerly independent JSON-LD parser/serializer, improvements to Namespaces that allow for IDE namespace
prompting, simplified use of `g.serialize()` (turtle default, no need to `decode()`) and many other updates to
documentation, store backends and so on.

Performance of the in-memory store has also improved since Python 3.6 dictionary improvements.

There are numerous supplementary improvements to the toolkit too, such as:

* inclusion of Docker files for easier CI/CD
* black config files for standardised code formatting
* improved testing with mock SPARQL stores, rather than a reliance on DBPedia etc

~~~~~~

Changes:

* fix README image display
* fix version acquisition in setup.py

~~~~~~

Changes:

* Depend on RDFLib v5.0+

* Removed rdflib_jsonld as a requirement. It is included in rdflib 6.0

* Detect if rdflib 6.0 is in use, and do not import the jsonld module

~~~~~~

Changes:

* Added stdeb.cfg file, and notes in requirements-dev.txt for building a debian package

* Removed the .py extension from the files in the scripts directory

* Same change as above but for the RDFConvertService script

* Fix Qualified Max Cardinality 0 Bug

* Fix output printing of owlrl commandline script