Update pyproject.toml

sdispater · sdispater · commit 807f0e1db03a · 2018-05-28T13:36:36.000-05:00
diff --git a/pyproject.toml b/pyproject.toml
@@ -30,3 +30,4 @@ pytest-cov = "^2.5"
 pytz = ">=2018.3"
 babel = "^2.5"
 cleo = "^0.6.1"
+tox = "^3.0"
