silence tox about commands external to testenv

such use will not work in tox 4, so fix it before it breaks

1 files changed, 1 insertions, 0 deletions

diff --git a/tox.ini b/tox.ini
index 99ee89b..5828022 100644
--- a/tox.ini
+++ b/tox.ini
@@ -57,6 +57,7 @@ basepython=python3.8
 
 [testenv:coverage]
 sitepackages=True
+whitelist_externals=coverage
 commands = coverage run --branch -m pytest --hypothesis-show-statistics {posargs:src/ecdsa}
 
 [testenv:speed]