run autoformat

apologies to anyone finding this commit via git blame or log

run the autoformatting by

    pre-commit run --all-files

examples/external-oauth/jupyterhub_config.py

@@ -4,7 +4,9 @@ import os
 # this could come from anywhere
 api_token = os.getenv("JUPYTERHUB_API_TOKEN")
 if not api_token:
-    raise ValueError("Make sure to `export JUPYTERHUB_API_TOKEN=$(openssl rand -hex 32)`")
+    raise ValueError(
+        "Make sure to `export JUPYTERHUB_API_TOKEN=$(openssl rand -hex 32)`"
+    )
 
 # tell JupyterHub to register the service as an external oauth client
 
@@ -14,5 +16,5 @@ c.JupyterHub.services = [
         'oauth_client_id': "whoami-oauth-client-test",
         'api_token': api_token,
         'oauth_redirect_uri': 'http://127.0.0.1:5555/oauth_callback',
-    },
+    }
 ]