Update tox url in tox.ini

The previous one lead to a dead-end 404.

1 files changed, 1 insertions, 1 deletions

diff --git a/tox.ini b/tox.ini
index c263284..742888c 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,4 +1,4 @@
-# Tox (https://testrun.org/tox/latest/) is a tool for running tests
+# Tox (https://tox.readthedocs.io/en/latest/) is a tool for running tests
 # in multiple virtualenvs. This configuration file will run the
 # test suite on all supported python versions. To use it, "pip install tox"
 # and then run "tox" from this directory.