Upgrade to zope.testrunner 4.9.1

Author: amotl

versions.cfg

@@ -60,7 +60,7 @@ zope.interface = 4.1.1
 
 # Required by:
 # zc.recipe.testrunner==2.0.0
-zope.testrunner = 4.4.3
+zope.testrunner = 4.9.1
 gp.recipe.tox = 0.4
 
 requests = 2.5.0