Remove Live precious metal prices, it's broken

Live precious metal prices returns http code 500 when accessed

README.md

@@ -765,7 +765,6 @@ API | Description | Auth | HTTPS | CORS |
 | [Indian Mutual Fund](https://www.mfapi.in/) | Get complete history of India Mutual Funds Data | No | Yes | Unknown |
 | [Intrinio](https://intrinio.com/) | A wide selection of financial data feeds | `apiKey` | Yes | Unknown |
 | [Klarna](https://docs.klarna.com/klarna-payments/api/payments-api/) | Klarna payment and shopping service | `apiKey` | Yes | Unknown |
-| [Live precious metal prices](https://notnullsolutions.com/live-metal-prices-api/live-precious-metal-prices-api-documentation) | Live prices for all precious metals like Gold | `apiKey` | Yes | Unknown |
 | [MercadoPago](https://www.mercadopago.com.br/developers/es/reference) | Mercado Pago API reference - all the information you need to develop your integrations | `apiKey` | Yes | Unknown |
 | [Mono](https://mono.co/) | Connect with users’ bank accounts and access transaction data in Africa | `apiKey` | Yes | Unknown |
 | [Moov](https://docs.moov.io/api/) | The Moov API makes it simple for platforms to send, receive, and store money | `apiKey` | Yes | Unknown |