Change the envvar for tox env to the officla tox one
diff --git a/.travis/run.sh b/.travis/run.sh
index e4ff266..1efbd60 100755
--- a/.travis/run.sh
+++ b/.travis/run.sh
@@ -18,4 +18,4 @@
     fi
 fi
 source ~/.venv/bin/activate
-tox -e $TOX_ENV -- $TOX_FLAGS
+tox -- $TOX_FLAGS