the tox deps upgrade

Author: zhenwei-li

tox.ini

@@ -25,9 +25,18 @@ allowlist_externals =
     /bin/bash
 changedir =
     tests
+# https://tox.readthedocs.io/en/latest/config.html#conf-deps
 deps =
-    build
+    flake8
+    virtualenv
+    setuptools
+    wheel
     discover
+    tox
+    toml
+    tox-travis
+    build
+    twine
 commands =
     ; windows: python --version
     ; macos,linux: python --version