readme: added example for message versioning

README.md

@@ -47,13 +47,30 @@ bunbun-worker = { git = "https://git.4o1x5.dev/4o1x5/bunbun-worker", branch = "m
 
 ## Usage
 
-Here is a basic implementation of an RPC job in bunbun-worker
+### Message versioning
+
+In this crate message versioning is done by including `v1.0.0` or such on the end of the queue name, instead of including it in the headers of a message. This reduces the amount of redelivered messages.  
+The following example will send a job to a queue named `emailjob-v1.0.0`.
+
+```rust
+let result = client
+        .rpc_call::<EmailJob>(
+            EmailJob {
+                send_to: "someone".into(),
+                contents: "something".into(),
+            },
+            BasicCallOptions::default("emailjob")
+                .timeout(Duration::from_secs(3))
+                .message_version("v1.0.0")
+        )
+        .await
+        .unwrap();
+```
 
 # Limitations
 
 1. Currently some `unwrap()`'s are called inside the code and may results in panics (not in the job-runner).
-2. No settings, and very limited API
-3. The rabbitmq RPC logic is very basic with no message-versioning (aside using different queue names (eg service-class-v1.0.0) )
+2. limited API
 
 # Bugs department