README: add reference to PyOpenSSL
The tests won't run without it.
@@ -24,7 +24,7 @@ run this module. Additionally, you need an installed libjansson and libcurl.
And additionally, you want an installed OpenSSL >=1.0.2, where libcurl is built
against. It may work with other *SSL libraries, however I have not verified that.
-To run the tests, you need [pytest](https://docs.pytest.org/en/latest/) and a local [boulder](https://github.com/letsencrypt/boulder) installation (I use the docker one they provide. Read the instructions in their excellent documentation). The instance I run via
+To run the tests, you need [pytest](https://docs.pytest.org/en/latest/), [PyOpenSSL](https://pyopenssl.org/en/stable/), and a local [boulder](https://github.com/letsencrypt/boulder) installation (I use the docker one they provide. Read the instructions in their excellent documentation). The instance I run via
```
docker-compose run -e FAKE_DNS=192.168.1.65 --service-ports boulder ./start.py
