docs(readme): use ProxyAgent in example (#465)

Author: itpropro

README.md

@@ -346,12 +346,12 @@ const data = await ofetch("https://icanhazip.com");
 **Example:** Allow self-signed certificates (USE AT YOUR OWN RISK!)
 
 ```ts
-import { Agent } from "undici";
+import { ProxyAgent } from "undici";
 import { ofetch } from "ofetch";
 
 // Note: This makes fetch unsecure against MITM attacks. USE AT YOUW OWN RISK!
-const unsecureAgent = new Agent({ connect: { rejectUnauthorized: false } });
-const unsecureFetch = ofetch.create({ dispatcher: unsecureAgent });
+const unsecureProxyAgent = new ProxyAgent({ requestTls: { rejectUnauthorized: false } });
+const unsecureFetch = ofetch.create({ dispatcher: unsecureProxyAgent });
 
 const data = await unsecureFetch("https://www.squid-cache.org/");
 ```