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

@@ -72,6 +72,9 @@ export class HttpClient {
       case "eth_getStorageAt":
         defaultBlock = params[2];
         break;
+      case "eth_feeHistory":
+        defaultBlock = params[1];
+        break;
     };
 
     switch (defaultBlock) {