Do not warn about unused ignores with mypy

setup.cfg:
Disable the warning for unused ignores in mypy as there seems to be an
issue between versions of mypy about what is considered an "unused
ignore".

Author: dvzrv

setup.cfg

@@ -91,3 +91,7 @@ warn_unused_ignores = true
 warn_redundant_casts = true
 warn_unused_configs = true
 warn_unreachable = true
+
+[mypy-coverage_conditional_plugin]
+# We allow unused `ignore` comments, because we cannot sync it between versions:
+warn_unused_ignores = false