silence tox about commands external to testenv

tomato42 · tomato42 · commit 73a245f45628 · 2019-12-02T23:39:48.000+01:00
such use will not work in tox 4, so fix it before it breaks
diff --git 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]
