Prepare for 0.5 release

Signed-off-by: Doug Hellmann <doug.hellmann@dreamhost.com>

announce.rst

@@ -1,5 +1,5 @@
 ===============
- stevedore 0.3
+ stevedore 0.5
 ===============
 
 .. tags:: stevedore release python
@@ -25,10 +25,8 @@ dynamically loaded extensions.
 What's New?
 ===========
 
-- Added dispatch managers for selecting among a set of plugins at
-  runtime instead of load time.
-- Added ``__call__`` method to ``DriverManager`` so it can be invoked
-  in a more natural fashion for a single plugin.
+- Add ``TestExtensionManager`` for writing tests for classes that use
+  extension managers.
 
 Installing
 ==========

setup.py

@@ -16,7 +16,7 @@ install_requires = ['distribute',
 
 setup(
     name='stevedore',
-    version='0.4',
+    version='0.5',
 
     description='Manage dynamic plugins for Python applications',
     long_description=long_description,