Fixed Streamable HTTP Example

I tried copying the Streamable HTTP example and it didn't work until I updated these imports.

Author: ferrants

README.md

@@ -221,7 +221,8 @@ import express from "express";
 import { randomUUID } from "node:crypto";
 import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
 import { StreamableHTTPServerTransport } from "@modelcontextprotocol/sdk/server/streamableHttp.js";
-import { InMemoryEventStore } from "@modelcontextprotocol/sdk/inMemory.js";
+import { InMemoryEventStore } from "@modelcontextprotocol/sdk/examples/shared/inMemoryEventStore.js";
+import { isInitializeRequest } from "@modelcontextprotocol/sdk/types.js"
 
 
 const app = express();