Updated files with 'repo_helper'. (#11)

Co-authored-by: repo-helper[bot] <74742576+repo-helper[bot]@users.noreply.github.com>

Author: repo-helper[bot]

tox.ini

@@ -30,7 +30,7 @@ setenv = PYTHONDEVMODE = 1
 deps = importcheck>=0.1.0
 commands =
     python --version
-    python -Werror -m importcheck {posargs}
+    python -m importcheck {posargs}
 
 [testenv:build]
 skip_install = True