Unify Composer concept

src/Composer/Command/AboutCommand.php

@@ -37,7 +37,7 @@ EOT
     {
         $this->getIO()->write(
             <<<EOT
-<info>Composer - Package Management for PHP</info>
+<info>Composer - Dependency Manager for PHP</info>
 <comment>Composer is a dependency manager tracking local dependencies of your projects and libraries.
 See https://getcomposer.org/ for more information.</comment>
 EOT