Lower coverage requirement to 75%

With the upcoming removal of legacy interfaces and related tests, the
ratio of tested to untested code changes significantly.

This does not mean that the test coverage of the Signer API decreases!

Also note that overall test coverage might be higher (see secure-systems-lab#208).

Signed-off-by: Lukas Puehringer <lukas.puehringer@nyu.edu>

Author: Lukas Puehringer

tox.ini

@@ -21,7 +21,7 @@ deps =
 commands =
     python -m tests.check_gpg_available
     coverage run tests/aggregate_tests.py
-    coverage report -m --fail-under 83
+    coverage report -m --fail-under 75
 
 [testenv:purepy311]
 deps =