Release 3.3.1

• Depends on sinatra ~> 4.0 rather than 3.1.
• Depends on rack-rdf >= 3.3.1.

Release 3.3.0

Updates for version 3.3.0 with minimum Ruby version 3.0.

Release 3.2.1

• Update documentation links to use gh-pages, and add action to publish gh-pages from Yard docs.
• Relax dependencies on sinatra, rack, and rack-test.
• Update dependencies to sinatra 3 rack-rdf >= 3.2.3.

Release 3.2.0

• Minimum Ruby version now 2.6.

Release 3.1.2

Use rack-rdf 3.1.2.