Fixed code snippets' styling.

CHANGES.md

@@ -5,11 +5,14 @@
   RQ a timeout value while enqueueing a function, use the explicit invocation
   instead:
 
+      ```python
       q.enqueue(do_something, args=(1, 2), kwargs={'a': 1}, timeout=30)
+      ```
 
 - Add a `@job` decorator, which can be used to do Celery-style delayed
   invocations:
 
+      ```python
       from redis import Redis
       from rq.decorators import job
 
@@ -19,12 +22,15 @@
       @job('high', timeout=10, connection=redis)
       def some_work(x, y):
           return x + y
+      ```
 
   Then, in another module, you can call `some_work`:
 
+      ```python
       from foo.bar import some_work
 
       some_work.delay(2, 3)
+      ```
 
 
 ### 0.2.2