Fix tests (work in progress) (#796)

* Add pyOpenSSL to dev requirements to fix tests on py2

* Add pyOpenSSL to the install requires

* Remove pyOpenSSL from install_requires

requirements-dev.txt

@@ -6,4 +6,5 @@ pytest-httpbin>=0.0.6
 docutils
 wheel
 pycodestyle
-twine
+pyOpenSSL
+twine

setup.py

@@ -36,7 +36,7 @@ tests_require = [
 
 install_requires = [
     'requests>=2.21.0',
-    'Pygments>=2.3.1'
+    'Pygments>=2.3.1',
 ]