Merge pull request #859 from scitran/test-ssl-upgrade

Pin to latest pyOpenSSL package

requirements.txt

@@ -3,7 +3,7 @@ enum==0.4.6
 jsonschema==2.6.0
 Markdown==2.6.5
 pymongo==3.2
-pyOpenSSL==0.15.1
+pyOpenSSL >=17.1.0,<18.0
 python-dateutil==2.4.2
 pytz==2015.7
 requests==2.9.1