Uh oh, whoops, `pre-commit autoupdate --repo foo` only leaves foo
My bad 🤦‍♂️  

So it's supposed to leave everything else 'as is' and just update repo foo.

Whereas now it deletes all the other repos in the `.pre-commit-config.yaml`, and leaves the updated foo.
diff --git a/pre_commit/commands/autoupdate.py b/pre_commit/commands/autoupdate.py
index ca8f9bb..5ba5a8e 100644
--- a/pre_commit/commands/autoupdate.py
+++ b/pre_commit/commands/autoupdate.py
@@ -116,11 +116,12 @@ def autoupdate(runner, tags_only, repo=None):
     input_config = load_config(runner.config_file_path)
 
     for repo_config in input_config['repos']:
-        # Skip any repo_configs that aren't the specified repo
-        if repo and repo != repo_config['repo']:
-            continue
-
-        if is_local_repo(repo_config) or is_meta_repo(repo_config):
+        if (
+            is_local_repo(repo_config) or
+            is_meta_repo(repo_config) or
+            # Skip updating any repo_configs that aren't for the specified repo
+            repo and repo != repo_config['repo']
+        ):
             output_repos.append(repo_config)
             continue
         output.write('Updating {}...'.format(repo_config['repo']))
diff --git a/tests/commands/autoupdate_test.py b/tests/commands/autoupdate_test.py
index c78af1f..ee20c7d 100644
--- a/tests/commands/autoupdate_test.py
+++ b/tests/commands/autoupdate_test.py
@@ -127,10 +127,12 @@ def test_autoupdate_out_of_date_repo(
 def test_autoupdate_out_of_date_repo_with_correct_repo_name(
         out_of_date_repo, in_tmpdir, mock_out_store_directory,
 ):
-    # Write out the config
-    config = make_config_from_repo(
+    stale_config = make_config_from_repo(
         out_of_date_repo.path, sha=out_of_date_repo.original_sha, check=False,
     )
+    local_config = config_with_local_hooks()
+    config = {'repos': [stale_config, local_config]}
+    # Write out the config
     write_config('.', config)
 
     runner = Runner('.', C.CONFIG_FILE)
@@ -141,6 +143,7 @@ def test_autoupdate_out_of_date_repo_with_correct_repo_name(
     assert ret == 0
     assert before != after
     assert out_of_date_repo.head_sha in after
+    assert local_config['repo'] in after
 
 
 def test_autoupdate_out_of_date_repo_with_wrong_repo_name(
['pre_commit/commands/autoupdate.py', 'tests/commands/autoupdate_test.py']