Fix check-manifest

Author: saimn

tox.ini

@@ -26,7 +26,7 @@ deps =
     collective.checkdocs
 commands =
     python setup.py check --restructuredtext
-    check-manifest -v --ignore sigal/version.py,.readthedocs.yml {toxinidir}
+    check-manifest -v --ignore sigal/version.py,*.yml,*.yaml,.git-blame-ignore-revs {toxinidir}
 
 [testenv:doc]
 whitelist_externals = make