Fix(Psr4) Add Psr-4 load in the composer.json

[roke22]

Please review but now you can use namespaces to load the class. For example:

use Binance\API; $api = new API($api_key, $api_secret);

[dmzoneill]

please look at the previous commits in your review

[dmzoneill]

needs rebase

[roke22]

Sorry for the delay