Support of Symfony 3 version in composer

[shakaran]

I am from Spain, using your code for "Addon Payments" through "La Caixa" bank.

I have client using Symfony 3.3 that needs support to implement the real enviroment (we are in the sandbox right now). I just filled the PR #26 that should allow us install the code in our Symfony installation.

Please we need this with urgency in the main development (I am using my own fork to serve to my client for now). Thanks

[manelds]

I have the same problem that @shakaran. In my case with Laravel 5.8 based on Symfony 4. I sent a PR #36 that should allow install with Symfony 3 and 4 projects.

Thanks.