v0.7.0

[uniqueg]

• support chaining errors in custom exception handler for more informative error messages/tracebacks in debug mode
• do not encode relative descriptor paths by default as implementations should support unencrypted paths
• add TRSClient class configuration parameter no_validate to skip JSON validation for cases where TRS implementations are not fully compliant with the TRS API specification used in TRS-cli
• fully support responses of content types text/plain and application/json as per the TRS API specification
• support new versioned TRS URI format (see Describe versioned TRS URIs ga4gh/tool-registry-service-schemas#202)