add new eip1559 rpc call

Author: shalzz

src/handler.ts

@@ -48,6 +48,7 @@ export async function handleRequest(request: Request) {
     'eth_submitWork',
     'eth_submitHashrate',
     'eth_getProof',
+    'eth_feeHistory',
   ];
 
   const httpClient = new HttpClient(url, <RequestInit>{

src/httpClient.ts

@@ -59,6 +59,8 @@ export class HttpClient {
       // Should always be from the latest block
       case "eth_blockNumber":
       case "eth_estimateGas":
+      case "eth_feeHistory":
+      case "eth_gasPrice":
         defaultBlock = "latest";
         break;
       // Extract the blocknumber / label