0.14.0

Enhancements

• Remove quotes from boundary in the content type header field of multipart related messages. Note: While the quotes were standard-compliant, some origin servers didn't handle them correctly.
• Accept "application/dicom+json" as well as "application/json" for query and retrieve metadata methods to improve backwards compatibility with older origin servers that implemented earlier versions of the DICOMweb standard.
• Improve type hints in method docstrings
• Update dependencies for running continuous integration tests
• Run test cases with additional Python 3 versions