Merge branch 'master' into bugfix_typo_which

Author: graingert

.github/workflows/main.yml

@@ -13,7 +13,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [3.6, 3.7, 3.8]
+        python-version: [3.6, 3.7, 3.8, 3.9]
         os: [macOS-latest, ubuntu-latest, windows-latest]
 
     steps:

pyproject.toml

@@ -16,6 +16,7 @@ classifiers = [
     "Programming Language :: Python :: 3.6",
     "Programming Language :: Python :: 3.7",
     "Programming Language :: Python :: 3.8",
+    "Programming Language :: Python :: 3.9",
 ]
 description-file = "README.rst"
 requires = ["fissix"]
@@ -78,17 +79,18 @@ legacy_tox_ini = """
 
 [tox]
 envlist =
-    py{36,37,38},lint
-minversion=3.20.0
+    py{36,37,38,39},lint
+minversion=3.20.1
+isolated_build=true
 requires=
-    virtualenv >= 20.0.31
-    tox-wheel >= 0.5.0
+    virtualenv >= 20.1.0
+    tox-wheel >= 0.6.0
+    tox-gh-actions >= 2.1.0
 
 [testenv]
 extras = test
 commands = pytest {posargs}
 wheel = True
-wheel_pep517 = True
 wheel_build_env = build
 
 [testenv:build]