Version 1.5.3
Support rdflib version 6+
The rdflib upgrade from version 5.0.0 to 6+ introduced breaking changes
in the rdflib library. This update fixes these breaks without changing
functionality, unpins the rdflib version and defaults to the latest
version on install.
Dropping official support for Python 3.5 and 3.6
The introduction of the rdflib 6+ library restricts the
Python support for 3.7+.
It is still possible to install odml with a Python version <=3.6,
but these versions are no longer tested and officially supported.