add release announcement

CHANGELOG

@@ -1,4 +1,4 @@
-Changese between 2.2.3 and 2.2.4
+Changes between 2.2.3 and 2.2.4
 -----------------------------------
 
 - fix error message for rewritten assertions involving the % operator

doc/announce/release-2.2.4.txt

@@ -0,0 +1,34 @@
+pytest-2.2.4: bug fixes, better junitxml/unittest/python3 compat
+===========================================================================
+
+pytest-2.2.4 is a minor backward-compatible release of the versatile
+py.test testing tool.   It contains bug fixes and a few refinements
+to junitxml reporting, better unittest- and python3 compatibility.
+
+For general information see here:
+
+     http://pytest.org/
+
+To install or upgrade pytest:
+
+    pip install -U pytest # or
+    easy_install -U pytest
+
+Special thanks for helping on this release to Ronny Pfannschmidt
+and Benjamin Peterson and the contributors of issues.
+
+best,
+holger krekel
+
+Changes between 2.2.3 and 2.2.4
+-----------------------------------
+
+- fix error message for rewritten assertions involving the % operator
+- fix issue 126: correctly match all invalid xml characters for junitxml
+  binary escape
+- fix issue with unittest: now @unittest.expectedFailure markers should
+  be processed correctly (you can also use @pytest.mark markers)
+- document integration with the extended distribute/setuptools test commands
+- fix issue 140: propperly get the real functions
+  of bound classmethods for setup/teardown_class
+- fix issue #141: switch from the deceased paste.pocoo.org to bpaste.net