remove flake8 and suggest pycqa/flake8

tests/autopep8_wrapper_test.py

@@ -1,10 +0,0 @@
-import pytest
-
-from pre_commit_hooks.autopep8_wrapper import main
-
-
-def test_invariantly_fails():
-    with pytest.raises(SystemExit) as excinfo:
-        main()
-    msg, = excinfo.value.args
-    assert 'https://github.com/pre-commit/mirrors-autopep8' in msg

tests/removed_test.py

@@ -0,0 +1,16 @@
+import pytest
+
+from pre_commit_hooks.removed import main
+
+
+def test_always_fails():
+    with pytest.raises(SystemExit) as excinfo:
+        main((
+            'autopep8-wrapper', 'autopep8',
+            'https://github.com/pre-commit/mirrors-autopep8',
+        ))
+    msg, = excinfo.value.args
+    assert msg == (
+        '`autopep8-wrapper` has been removed -- '
+        'use `autopep8` from https://github.com/pre-commit/mirrors-autopep8'
+    )