Merge pull request #477 from jazzband/master-to-main

Rename Django's dev branch to main.

tox.ini

@@ -1,7 +1,9 @@
 [tox]
 envlist =
-    py{36,37,38,39}-dj{22,30,31,master}
-    flake8, isort
+    py{36,37,38,39}-dj{22,30,31}
+    py{38,39}-djmain
+    flake8
+    isort
 
 [gh-actions]
 python =
@@ -17,9 +19,11 @@ deps =
     dj22: Django==2.2.*
     dj30: Django==3.0.*
     dj31: Django==3.1.*
-    djmaster: https://github.com/django/django/archive/master.tar.gz
+    djmain: https://github.com/django/django/archive/main.tar.gz
 ignore_outcome =
-    djmaster: True
+    djmain: True
+ignore_errors =
+    djmain: True
 passenv =
     CI
     GITHUB_*
@@ -28,9 +32,6 @@ usedevelop = True
 commands =
     pytest {posargs}
 
-[testenv:py{36,37,38,39}-djmaster]
-ignore_errors = True
-
 [testenv:flake8]
 basepython =
     python3.8