Now depends on billiard 3.3.0.4

requirements/default.txt

@@ -1,3 +1,3 @@
 pytz>dev
-billiard>=3.3.0.3,<3.4
+billiard>=3.3.0.4,<3.4
 kombu>=3.0.4,<4.0

setup.cfg

@@ -15,5 +15,5 @@ upload-dir = docs/.build/html
 
 [bdist_rpm]
 requires = pytz >= 2011b
-           billiard >= 3.3.0.3
+           billiard >= 3.3.0.4
            kombu >= 3.0.4