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Maintenance release, focusing on change requests from users.
* 23: Add support for partial resolution, i.e. resolving only internal references,
local files, HTTP URLs, or any combination thereof.
* 36: Improve error handling by mentioning strict mode when openapi-spec-validator
raises TypeError with very little context.
* 46: Reduce reliance on network in tests. Tests that require a network connection
can now be skipped via "-m 'not requires_network'". Other tests have mocked
connections.
* 55: RefResolver could set recursion limits, but the ResolvingParser did not
pass related options on to the resolver. Fixed that. Also create & use
reference cache in ResolvingParser.
* 60: Improve output when resolving references, by indicating the type of problem
(missing key, index out of bounds) in the object or sequence where the error
occurred.