Set version to 3.0.4 and start release notes

docs/source/release-notes/3.0.4.rst

@@ -0,0 +1,15 @@
+3.0.4 -- 2016-08-08
+-------------------
+
+- Side-step a Pickling Error when using Flake8 with multiprocessing on Unix
+  systems. (See also `GitLab#164`_)
+
+- Fix an Attribute Error raised when dealing with Invalid Syntax. (See also
+  `GitLab#203`_)
+
+
+.. links
+.. _GitLab#164:
+    https://gitlab.com/pycqa/flake8/issues/164
+.. _GitLab#203:
+    https://gitlab.com/pycqa/flake8/issues/203

docs/source/release-notes/index.rst

@@ -6,6 +6,7 @@ All of the release notes that have been recorded for Flake8 are organized here
 with the newest releases first.
 
 .. toctree::
+    3.0.4
     3.0.3
     3.0.2
     3.0.1

src/flake8/__init__.py

@@ -27,7 +27,7 @@ LOG.addHandler(NullHandler())
 # Clean up after LOG config
 del NullHandler
 
-__version__ = '3.0.3'
+__version__ = '3.0.4.dev0'
 __version_info__ = tuple(int(i) for i in __version__.split('.') if i.isdigit())