6.0.0
- [CHANGED] internal HTTP client to Guzzle
- [ADDED] optional client parameter to constructor
- [CHANGED] useTLS is true by default
- [REMOVED] from options
- [REMOVED] customer logger
- [REMOVED] host, port and timeout constructor parameters
- [REMOVED] support for PHP 7.1
- [CHANGED] lower severity level of logging to DEBUG level