Fixes missing whitespace in bdist_rpm requires. Cloes #1046

setup.cfg

@@ -15,5 +15,5 @@ upload-dir = docs/.build/html
 
 [bdist_rpm]
 requires = pytz
-           billiard>=2.7.3.17
+           billiard >= 2.7.3.17
            kombu >= 2.4.7