Update TypeScript types to match actual request object passed to handlers (#64)

In the README it states (and in my experience also) the handler doesn't get a full on `FastifyRequest` object. It gets an `http.IncomingMessage` instead! This makes the TypeScript types reflect that.

Author: airhorns

index.d.ts

@@ -31,7 +31,7 @@ declare module 'fastify' {
   export type WebsocketHandler = (
     this: FastifyInstance<Server, IncomingMessage, ServerResponse>,
     connection: SocketStream,
-    request: FastifyRequest,
+    request: IncomingMessage,
     params?: { [key: string]: any }
   ) => void | Promise<any>;
 }

test/types/index.test-d.ts

@@ -6,18 +6,18 @@ import { Server } from 'ws';
 
 const handler: WebsocketHandler = (
   connection: SocketStream,
-  req: FastifyRequest,
+  req: IncomingMessage,
   params
 ) => {
   expectType<SocketStream>(connection);
   expectType<Server>(app.websocketServer);
-  expectType<FastifyRequest<HttpServer, IncomingMessage, RequestGenericInterface>>(req)
+  expectType<IncomingMessage>(req)
   expectType<{ [key: string]: any } | undefined>(params);
 };
 
 const handle = (connection: SocketStream): void => {
   expectType<SocketStream>(connection)
-} 
+}
 
 const app: FastifyInstance = fastify();
 app.register(wsPlugin);