The page says PHP 5.3+ works, yet when I run composer I get:
Loading composer repositories with package information Updating dependencies Your requirements could not be resolved to an installable set of packages. Problem 1 - Installation request for satooshi/php-coveralls dev-master -> satisfiable by satooshi/php-coveralls[dev-master]. - satooshi/php-coveralls dev-master requires php ^5.5 || ^7.0 -> your PHP version (5.4.16) does not satisfy that requirement.
... so "5.3+" is not accurate?