Add Rector

[coveralls]

Pull Request Test Coverage Report for Build 1794619149

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 44 unchanged lines in 1 file lost coverage.
• Overall coverage remained the same at 85.007%

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Files with Coverage Reduction	New Missed Lines	%
src/Readability.php	44	86.38%
<!--	Total:	44		-->

Totals
Change from base Build 1793235385:	0.0%
Covered Lines:	601
Relevant Lines:	707

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💛 - Coveralls