Improve the README

README.md

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-> A single command to run PHP code formatters like CodeSniffer or PHP-CS-Fixer.
+**A single command to run PHP code formatters like CodeSniffer or PHP-CS-Fixer.**
+
+---
 
 [PHP CodeSniffer](https://github.com/squizlabs/PHP_CodeSniffer) and [PHP-CS-Fixer](https://github.com/FriendsOfPHP/PHP-CS-Fixer) are powerful but using them is not simple. It is not always obvious which tool a project uses and whether there is a configuration file to use or whether you need to provide options to the CLI command.