[[breaking_changes]]
== Breaking changes from 5.x

### Removal of ClientBuilder::defaultLogger()

In 5.x there is the ability to create a default Logger object, which has been removed. It is now required to explicitly make a Logger object.

5.x
```
$logger = ClientBuilder::defaultLogger('path_to_log_file');
```

6.5
```
$logger = new Logger('name');
$logger->pushHandler(new StreamHandler('path_to_log_file', Logger::WARNING);
```