testing: Switch to Python 3.9

Don't bother with older versions.

.pre-commit-config.yaml

@@ -3,7 +3,7 @@ repos:
   rev: v1.4.0
   hooks:
   - id: autopep8-wrapper
-    language_version: python2
+    language_version: python3
     args:
     - --in-place
     - --aggressive
@@ -11,40 +11,40 @@ repos:
     - --ignore=E731
     - --max-line-length=131
   - id: check-added-large-files
-    language_version: python2
+    language_version: python3
   - id: check-ast
-    language_version: python2
+    language_version: python3
   - id: check-case-conflict
-    language_version: python2
+    language_version: python3
   - id: check-docstring-first
-    language_version: python2
+    language_version: python3
   - id: debug-statements
-    language_version: python2
+    language_version: python3
   - id: double-quote-string-fixer
-    language_version: python2
+    language_version: python3
   - id: end-of-file-fixer
-    language_version: python2
+    language_version: python3
     exclude_types: [batch, lua]
   - id: fix-encoding-pragma
-    language_version: python2
+    language_version: python3
   - id: flake8
-    language_version: python2
+    language_version: python3
     args:
     - --max-complexity=10
     - --max-line-length=131
     - --ignore=E402,E731
     - --exclude=bin/autojump_argparse.py
   - id: name-tests-test
-    language_version: python2
+    language_version: python3
   - id: requirements-txt-fixer
-    language_version: python2
+    language_version: python3
   - id: trailing-whitespace
-    language_version: python2
+    language_version: python3
 - repo: git@github.com:asottile/reorder_python_imports.git
   rev: v1.1.1
   hooks:
   - id: reorder-python-imports
-  language_version: python2
+  language_version: python3
 - repo: git@github.com:asottile/add-trailing-comma
   rev: v0.7.0
   hooks:

Makefile

@@ -59,7 +59,7 @@ test-xfail: pre-commit
 
 .PHONY: test-fast
 test-fast: pre-commit
-	@tox -e py27
+	@tox -e py39
 
 .PHONY: clean
 clean:

tox.ini

@@ -1,10 +1,6 @@
 [tox]
 envlist =
-    py26,
-    py27,
-    py33,
-    py34,
-    py35
+    py39
 # ignore missing setup.py
 skipsdist = True