[Feature Request]Ability to accept other crypto currencies besides Bitcoin

With crypto currencies becoming more and more prevalent as a preferred way to do business, I think it would be a great enhancement to Invoice Ninja if it supported other crypto currencies besides Bitcoin. The folks over at CoinPayments https://www.coinpayments.net/ make this possible. They support almost 60 coins with more coming online and provide the necessary apis for integration. Take a look at their service, I am sure many others in the Invoice Ninja community would like this. Please note that I am in no way affiliated with CoinPayments, I only wish I could use their service within Invoice Ninja.