2.0.0

• Major BC break: Change concept.concept_id from Integer to String to allow
  storing concepts and collections with a non-numeric id. Existing instance will
  need to update their SQL database. Please consult the docs or the README for
  some help in doing so. (#87)
• Skosprovider_sqlalchemy now depends on SQLAlchemy 1.4 or higher and should be
  compatible with SQLAlchemy 2. Older versions of SQLAlchemy are no longer
  supported. (#90)
• Refactored the Skosprovider_sqlalchemy constructor to call the super constructor. (#95)
• Drop support for Python 3.6 and 3.7. Add support for Python 3.11. (#86)
• Drop pyup support. (#85)