2.1.1

Note: this version is synchronised with a major update to tx.fhir.org.
Implementers SHOULD upgrade to this version immediately - this is the
oldest IGPublisher version supported for use with the new server. On
the other hand, theres no change to the terminology server API - older
version of the Implementers SHOULD continue to work. But how some cases
are handled - particularly around supplements - has changed.

• General: update dependencies
• Loader: fix processing of value set versions when pinning canonicals
• Loader: Fix stated version when rendering explicitly pinned canonicals
• Terminology Support: Update internal terminology server for new server on tx.fhir.org
• Version Convertor: Fix NPE converting bad property converting from R4 to R5
• Version Convertor: fix NPE reading extensions with no value
• Validator: fix bug reporting wrong version when validating value sets
• Renderer: fix case of forloop variable in liquid implementation
• QA: find additional canonical URLs when validating links