Added zope python package

see: schleuss/certbot_dns_freedns#3

Author: jc21

docker/Dockerfile.certbot

@@ -36,7 +36,7 @@ RUN curl -L 'https://bootstrap.pypa.io/get-pip.py' | python3
 
 RUN pip install --no-cache-dir --upgrade pyopenssl \
 	&& pip install --no-cache-dir cffi certbot cryptography \
-	&& pip install tldextract
+	&& pip install tldextract zope
 
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