Fix deprecated message

[j0k3r]

Method "Psr\Log\LoggerAwareInterface::setLogger()" might add "void" as a native return type declaration in the future. Do the same in implementation "Readability\Readability" now to avoid errors or add an explicit @return annotation to suppress this message.

[coveralls]

Pull Request Test Coverage Report for Build 1517693631

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 87.662%

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Totals
Change from base Build 1399347881:	0.0%
Covered Lines:	540
Relevant Lines:	616

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💛 - Coveralls