Don't install graphviz>=0.6 under Python 2.6
Fixes failing build since graphviz dropped support for Python 2.6
Ref:
@@ -89,6 +89,8 @@ extras_require = {
# http://docs.cherrypy.org/en/latest/advanced.html?highlight=windows#windows-console-events
':sys_platform == "win32"': ['pypiwin32'],
+
+ ':python_version == "2.6"': ['graphviz<0.6'], # v0.6 has dropped support for 2.6
}
"""Feature flags end-users can use in dependencies"""
