Version 0.3.0

• Add support for more endpoints and models
• Cache the IX-API version for the lifetime of the client
• Make save() refresh the record from the server response
• Fix a crash in save() and delete() caused by a missing user agent
• Fix change detection so list values containing the separator are no longer conflated
• Count single-object responses as a single result
• #12 Add a unit test suite and report branch coverage to Codecov
• Update PyJWT to address known vulnerabilities

Breaking: removed the unused Token.__str__(); use Token.encoded to get the raw token string.