docs: def get_bel_versions() -> List[str]:
      """Get BEL Language versions supported
  
      Get the list of all BEL Language versions supported.  The file this depends
      on is generated by belspec_yaml2json and is kept up to date using
      `make update_ebnf` or `make update_parsers`.  You can also run `belspec_yaml2json`
      directly as it's added as a command by pip install.
  
      Returns:
          List[str]: list of versions
      """
  
      spec_dir = config["bel"]["lang"]["specifications"]
  
      fn = f"{spec_dir}/versions.json"
      with open(fn, "r") as f:
          versions = json.load(f)
  
      return versions