Tests(tox): Change syntax for `envlist`

`[testenv:]` doesn't allow lists like `[testenv:py27,py3{4,5}]`;
it only allows syntax like `[testenv:py{27,34,35}]`.
This commit changes syntax for `envlist` to make it closer to `[testenv:]`.

diff --git a/tox.ini b/tox.ini
index a67a6937c9a431f7840b9fb17edd4b065e198382..9d3bda936a4085dca6e731e5eafad2f1b213c605 100644 (file)
--- a/tox.ini
+++ b/tox.ini
@@ -1,6 +1,6 @@
 [tox]
 minversion = 3.15
-envlist = py27,py3{4,5,6,7,8,9,10,11,12,13},pypy,pypy3
+envlist = py{27,34,35,36,37,38,39,310,311,312,313,py,py3}{,-flake8}
 
 [testenv]
 commands =