1.0 alpha 9

An early alpha release of pySBOL3. API changes are expected before a beta release.

Note breaking changes from previous alpha release:

• #243 overhauls the visitor pattern
  • accept now takes a visitor and invokes visit_<type> on the visitor with self as an argument
    • More information is available at https://pysbol3.readthedocs.io/en/latest/visitor.html
  • accept no longer takes a function and traverses the object hierarchy
    • The old behavior has been renamed to traverse

Other notable changes:

• SBOL 3.0.1 Namespace changes have been incorporated (#226)