Revert to using anyhow in README.md example

Author: rklaehn

README.md

@@ -35,10 +35,9 @@ Here is a basic example of how to set up `iroh-blobs` with `iroh`:
 ```rust,no_run
 use iroh::{protocol::Router, Endpoint};
 use iroh_blobs::{store::mem::MemStore, BlobsProtocol, ticket::BlobTicket};
-use n0_error::{Result, StdResultExt};
 
 #[tokio::main]
-async fn main() -> Result<()> {
+async fn main() -> anyhow::Result<()> {
     // create an iroh endpoint that includes the standard discovery mechanisms
     // we've built at number0
     let endpoint = Endpoint::bind().await?;