Namespace incorrect

I’m using Apache as web-server on Ubuntu 16.04 LTS:

As of version 1.15 of simplesamlphp, they changed namespace so the plugin code (simplesamlphp-authentication.php) should be changed in two places, namely
‘new SimpleSAML_Auth_Simple’
should be replaces with
‘new SimpleSAML\Auth\Simple’

Unless this is done, the /var/log/syslog may be flooded with php-warnings like this:

‘simplesamlphp[32955]: 4 [TR58b9ddc7] The class or interface ‘SimpleSAML_Auth_Simple’ is now using namespaces, please use ‘SimpleSAML\Auth\Simple’.