pre-commit autoupdate, show diff on failure, and force colour on GHA

.pre-commit-config.yaml

@@ -1,6 +1,6 @@
 repos:
   - repo: https://github.com/asottile/pyupgrade
-    rev: v2.4.4
+    rev: v2.6.1
     hooks:
       - id: pyupgrade
         args: ["--py3-plus"]
@@ -15,13 +15,13 @@ repos:
         types: []
 
   - repo: https://gitlab.com/pycqa/flake8
-    rev: 3.8.2
+    rev: 3.8.3
     hooks:
       - id: flake8
         additional_dependencies: [flake8-2020, flake8-implicit-str-concat]
 
   - repo: https://github.com/asottile/seed-isort-config
-    rev: v2.1.1
+    rev: v2.2.0
     hooks:
       - id: seed-isort-config
 

tox.ini

@@ -16,5 +16,6 @@ commands = {posargs}
 
 [testenv:lint]
 deps = pre-commit
-commands = pre-commit run --all-files
+commands = pre-commit run --all-files --show-diff-on-failure
 skip_install = true
+passenv = PRE_COMMIT_COLOR