Release 2.2.4

• Updates for upcoming 3.0 release.

Release 2.2.3

• Depend on haml ~> 5.x.
• Remove ugly option, which seems to be obsoleted.
• Change HAML default format to :xhtml

Release 2.2.2

Filter out Nokogumbo warning about document needing to start with DOCTYPE.

Release 2.2.0

If available, use Nokogumbo gem for pure-C HTML5 parse. This also avoids numerous errors from the Nokogiri HTML parser, that doesn't understand many HTML5 elements.

Release 2.1.0

• Update minimum ruby version to 2.2.2. See ruby-rdf/rdf#307.
• Add priority to content types.
• Updates for RDF.rb 2.2.

Release 2.0.1

Be more comprehensive about specific HTML5 and SVG element names so that they don't cause an error. Fixes #21.