Added funding wallet method

[ahsankhatri]

Added a method to fetch coins available in funding wallet

[ePascalC]

@ahsankhatri Can I ask you to update the comments please, so add the link to the Binance documentation and the weight? e.g. /** * apiRestriction - Fetch a set of API restrictions * * @link https://binance-docs.github.io/apidocs/spot/en/#get-api-key-permission-user_data * * @property int $weight 1 * * @return array containing the response * @throws \Exception */

Thanks.