Update Python dependencies

Author: mdmintz

requirements.txt

@@ -42,7 +42,8 @@ soupsieve==2.0.1;python_version>="3.5"
 beautifulsoup4==4.9.3
 cryptography==3.0;python_version<"3.6"
 cryptography==3.2.1;python_version>="3.6"
-pyopenssl==20.0.0
+pyopenssl==19.1.0;python_version<"3.6"
+pyopenssl==20.0.0;python_version>="3.6"
 pygments==2.5.2;python_version<"3.5"
 pygments==2.7.2;python_version>="3.5"
 traitlets==4.3.3;python_version<"3.7"

setup.py

@@ -146,7 +146,8 @@
         'beautifulsoup4==4.9.3',
         'cryptography==3.0;python_version<"3.6"',
         'cryptography==3.2.1;python_version>="3.6"',
-        'pyopenssl==20.0.0',
+        'pyopenssl==19.1.0;python_version<"3.6"',
+        'pyopenssl==20.0.0;python_version>="3.6"',
         'pygments==2.5.2;python_version<"3.5"',
         'pygments==2.7.2;python_version>="3.5"',
         'traitlets==4.3.3;python_version<"3.7"',