php 8.0 compatibility warning when running phpcs

[8ctopus]

FOUND 1 ERROR AFFECTING 1 LINE
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LINE 2: ERROR 'object' is a soft reserved keyword as of PHP version 7.0 and a reserved keyword as of PHP version 7.2 and should not be

              used to name a class, interface or trait or as part of a namespace (T_NAMESPACE)
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   1:  <?php
>> 2:  namespace Maknz\Slack\Object;

If you need a hand, I can create a pull request for it.

[cmbuckley]

Thanks, a PR would be appreciated. A better name for the namespace would probably be CompositionObject to match the abstract class and the Slack reference.

[8ctopus]

OK, on my way.