4.6.4

4.6.4 / 2021-02-03

• fix failing http_client spec after merging main
• Skip parsing response if content is not JSON
• Add missing http status codes / errors.
• Add reply_to to NewMessage
• Add message tracking to drafts.
• Truncate the returned filename so it's less than 256 characters and compatible with rb_sysopen.
• Bump required rest client dep to >= 2.0, remove travis ci tests for rest client 1, ruby v2.3
• Use to_json helper instead of JSON.dump.