Composer: Check for Newer Versions

If you want to find out which of your composer.json packages have released newer versions, just run composer outdated. You will get a full list with all information, like this below.

phpdocumentor/type-resolver 0.4.0 0.7.1
phpunit/php-code-coverage   6.1.4 7.0.3 Library that provides collection, processing, and rende...
phpunit/phpunit             7.5.9 8.1.3 The PHP Unit Testing framework.
ralouphie/getallheaders     2.0.5 3.0.3 A polyfill for getallheaders.
sebastian/global-state      2.0.0 3.0.0 Snapshotting of global state