Scrutinizer Auto-Fixes

This patch was automatically generated as part of the following inspection:
https://scrutinizer-ci.com/g/vend/php-resque/inspections/7b30b767-41f8-49e8-a7b6-3134e6806425

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Cleaner type hinting on interface
Merge pull request #5 from vend/scrutinizer-patch-1

Scrutinizer Auto-Fixes