Re-add accidentally removed changelog items

CHANGELOG

@@ -61,6 +61,10 @@ NEXT (2.6)
 
 - fix issue483: trial/py33 works now properly.  Thanks Daniel Grana for PR.
 
+- improve example for pytest integration with "python setup.py test"
+  which now has a generic "-a" or "--pytest-args" option where you
+  can pass additional options as a quoted string.  Thanks Trevor Bekolay.
+
 - simplified internal capturing mechanism and made it more robust
   against tests or setups changing FD1/FD2, also better integrated
   now with pytest.pdb() in single tests.
@@ -87,6 +91,9 @@ NEXT (2.6)
   functions, including unittest-style Classes.  If set to False, the 
   test will not be collected.  
 
+- fix issue512: show "<notset>" for arguments which might not be set
+  in monkeypatch plugin.  Improves output in documentation.
+
 
 2.5.2
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