adding fideloper/proxy as requirement

[dbrw]

Hi, I am trying to install your wonderfull app on my server.

My web apps are behind nginx reverse proxy, so I am unable to load all resources though https (which handled by nginx) because asset() helper function generate http url.

Maybe you want to add fideloper/proxy package as requirement so the asset() helper will works on others setup like mine.

[denisdulici]

Added this to the core. Now what you have to do is to publish the config and edit it as per your settings.