Reduce composer install time
Reduce composer install time

From: https://github.com/thephpleague/omnipay

Important Note: Compatibility with Symfony 3 Event Dispatcher

If you are using Symfony 3 (or Symfony 3 components), please note that
Omnipay 2.x still relies on Guzzle3, which in turn depends on
symfony/event-dispatcher 2.x. This conflicts with Symfony 3 (standard
install), so cannot be installed. Development for Omnipay 3.x is still
in progress at the moment.

If you are just using the Symfony 3 components (eg. stand-alone or
Silex/Laravel etc), you could try to force the install of
symfony/event-dispatcher:^2.8, which is compatible with both Symfony 3
components and Guzzle 3.

composer require symfony/event-dispatcher:^2.8

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