README.md in ezmq-0.3.7 vs README.md in ezmq-0.4.0

@@ -23,11 +23,13 @@
 
 ```
 require 'ezmq'
 
 server = EZMQ::Server.new
-server.listen
+server.listen do |message|
+  message
+end
 ```
 
 Synchronous Client Request
 --------------------------
 Sends a message, prints the reply when it arrives.
@@ -60,11 +62,13 @@
 ```
 require 'ezmq'
 require 'json'
 
 server = EZMQ::Server.new encode: -> m { JSON.dump m }, decode: -> m { JSON.load m }
-server.listen
+server.listen do |message|
+  message
+end
 ```
 
 JSON Synchronous Client Request
 -------------------------------
 Encodes a message in JSON, sends it twice, prints the first one raw, and decodes the second.
@@ -99,11 +103,13 @@
 
 ```
 require 'ezmq'
 
 subscriber = EZMQ.Subscriber.new topic: 'foorever'
-subscriber.listen
+subscriber.listen do |message, topic|
+  puts "[#{ topic }] #{ message }"
+end
 ````
 
 Pipeline Work Generator
 ------------------------
 Generates work, distributes it to workers via PUSH socket.
@@ -157,12 +163,14 @@
 ```
 require 'ezmq'
 require 'json'
 
 collector = EZMQ::Puller.new port: 5556
-collector.listen
+collector.listen do |message|
+  puts message
+end
 ```
-
+    
 Operating System Notes
 ======================
 
 As this relies on [ffi-rzmq](https://github.com/chuckremes/ffi-rzmq), you will need to have the zeromq libraries available.