Bump version v2.2.1 -> v2.3.0

Author: MBueschelberger

setup.cfg

@@ -1,6 +1,6 @@
 [metadata]
 name = data2rdf
-version = v2.2.1
+version = v2.3.0
 description = A generic pipeline that can be used to map raw data to RDF.
 long_description = file: README.md
 long_description_content_type = text/markdown