Prepare release 0.4

Update the history file and version number.

Change-Id: Ia09d4a9316dcc77775124f298ddde535707cfa0c
Signed-off-by: Doug Hellmann <doug.hellmann@dreamhost.com>

docs/source/history.rst

@@ -2,6 +2,10 @@
  History
 =========
 
+0.4
+
+  - Removed the ``name`` argument to plugin constructors.
+
 0.3
 
   - Added dispatch managers for selecting among a set of plugins at

setup.py

@@ -16,7 +16,7 @@ install_requires = ['distribute',
 
 setup(
     name='stevedore',
-    version='0.3',
+    version='0.4',
 
     description='Manage dynamic plugins for Python applications',
     long_description=long_description,