Release 3.3.0

• Update documentation links to use gh-pages, and add action to publish gh-pages from Yard do
• Updates for version 3.3.0 with minimum Ruby version 3.0.
• Updates Nokogiri to version 1.15 due to vulnerability.

Release 3.2.0

• Minimum Ruby version now 2.6.

Release 3.1.1

• Updates for RDF 3.1 release and Ruby 2.7 calling sequences.
• Properly parse and generate XMLLiteral.
• Support xml:base and relative IRI references in reader and writer.
• RDF-star reader and writer.
  • allows triple element to be recursively embedded.

Release 3.1.0

• Updates for RDF 3.1 release and Ruby 2.7 calling sequences.