Merge pull request #359 from tomzx/master

Add PHP Semantic Versioning Checker to the Code Analysis section.

README.md

 * [PHP Manipulator](https://github.com/schmittjoh/php-manipulator) - A library for analysing and modifying PHP Source Code.
 * [PHP Metrics](https://github.com/Halleck45/PhpMetrics) - A static metric library.
 * [PHP Refactoring Browser](https://github.com/QafooLabs/php-refactoring-browser) - A command line utility for refactoring PHP code.
+* [PHP Semantic Versioning Checker](https://github.com/tomzx/php-semver-checker) - A command line utility that compares two source sets and determines the appropriate semantic versioning to apply.
 * [UBench](https://github.com/devster/ubench) - A simple micro benchmark library.
 * [Athletic](https://github.com/polyfractal/athletic) - An annotation based benchmark framework.
 * [Mondrian](https://github.com/Trismegiste/Mondrian) - A code analysis tool using Graph Theory.