Merge pull request #243 from theupdateframework/prep-2.2.0

Prepare 2.2.0 release

Author: jku

tuf_conformance/__init__.py

@@ -1,6 +1,6 @@
 import pytest
 
-__version__ = "2.1.0"
+__version__ = "2.2.0"
 
 # register pytest asserts before the imports happen in conftest.py
 pytest.register_assert_rewrite("tuf_conformance.client_runner")