Release 3.3.0

• Update documentation links to use gh-pages, and add action to publish gh-pages from Yard docs.
• Define the format URI to http://www.w3.org/ns/formats/RDF_JSON.
• Updates for version 3.3.0 with minimum Ruby version 3.0.

Release 3.2.0

• Minimum Ruby version now 2.6.
• Change doap:license to https://unlicense.org/.
• Add failing spec for issue #7 (from @dkinzer).
• Fix places errantly using "application/json" and ".json" for the format, which should be "application/rdf+json" and ".rj", accordingly.

Release 3.1.0

• Updates for 3.1 release and Ruby 2.7 calling sequences.
• Lock down format detection in reader expectations.

2.0 Beta Release

Updates for RDF.rb 2.0 Beta

• Use RDF::Util::Logger.
• Ensure that the same BNode is used, rather than another one with the same identifier.
• Catch JSON::ParserError to log.
• Make sure #write_epilogue calls #super.
• Account for language case insensitivity.