oeg-upm/morph-kgc: 2.3.0

This release of Morph-KGC features `RML views` over tabular sources. RML views empower the mapping of tabular data to RDF enabling complex joins, transformation functions or mixed content by using SQL, a query language familiar to data engineers.

## Changes
#94: Parallelized materialization when running as a library on Linux.
#89: Support for [schema-qualified names](https://www.w3.org/TR/r2rml/#dfn-schema-qualified-name).
#87: Compacting and simplifying the internal representation of quoted maps.
#86: Emty arrays in JSON are now processed correctly.
#81: CSVs with any separator.
#80: Support for `.rml`, `.r2rml` and `.rml-star` file extensions.
#76: Support of mapping rules with all term maps being constant-valued.
#65: Handling non-atomic write operation in Windows.
#93: RML tabular views.
#84: Compacting and simplifying the internal representation of subject, predicate, object and graph maps.