Update zope.interface from 4.4.0 to 4.4.2

Author: pyup-bot

{{cookiecutter.project_slug}}/requirements.txt

@@ -51,4 +51,4 @@ translationstring==1.3
 virtualenv==15.1.0
 zope.component==4.4.0
 zope.event==4.2.0
-zope.interface==4.4.0
+zope.interface==4.4.2