Expose some DTLS-related features (#1026)

* Expose DTLS_METHOD and friends

* Expose OP_NO_RENEGOTIATION

* Expose DTLS MTU-related functions

* Expose DTLSv1_listen and associated callbacks

* Add a basic DTLS test

* Cope with old versions of openssl/libressl

* blacken

* Soothe flake8

* Add temporary hack to skip DTLS test on old cryptography versions

* Update for cryptography v35 release

* Add changelog entry

* Fix versionadded::

* get_cleartext_mtu doesn't exist on decrepit old openssl

* Rewrite DTLS test to work around stupid OpenSSL misbehavior

* flake8 go away

* minor tidying

1 files changed, 1 insertions, 1 deletions

diff --git a/setup.py b/setup.py
index 85c4569..ecc23cc 100755
--- a/setup.py
+++ b/setup.py
@@ -93,7 +93,7 @@ if __name__ == "__main__":
         package_dir={"": "src"},
         install_requires=[
             # Fix cryptographyMinimum in tox.ini when changing this!
-            "cryptography>=3.3",
+            "cryptography>=35.0",
         ],
         extras_require={
             "test": ["flaky", "pretend", "pytest>=3.0.1"],