Define sendAsync on HttpProvider

packages/web3-typescript-typings/index.d.ts

@@ -36,6 +36,10 @@ declare module 'web3' {
     namespace providers {
         class HttpProvider implements Web3.Provider {
             constructor(url?: string, timeout?: number, username?: string, password?: string);
+            public sendAsync(
+                payload: Web3.JSONRPCRequestPayload,
+                callback: (err: Error, result: Web3.JSONRPCResponsePayload) => void,
+            ): void;
         }
     }