Improved README. Added composer install method. Added syntax highlighting.
Improved README.
Added composer install method.
Added syntax highlighting.

dnalini/PHP-CODE-Coverage,sebastianbergmann/php-code-coverage,Koc/php-code-coverage,tarlabs/php-code-coverage-fix,sebastianbergmann/php-code-coverage,iFixit/php-code-coverage,kelunik/php-code-coverage,theseer/php-code-coverage,theseer/php-code-coverage,tarlabs/php-code-coverage-fix,sebastianbergmann/php-code-coverage,bwoebi/php-code-coverage,theseer/php-code-coverage