run autoformatters

Author: minrk

.pre-commit-config.yaml

@@ -3,7 +3,7 @@ repos:
   rev: v1.3.5
   hooks:
   - id: reorder-python-imports
-    language_version: python3.6
+    language_version: python3
 - repo: https://github.com/ambv/black
   rev: 18.9b0
   hooks:

nbviewer/providers/github/handlers.py

@@ -146,7 +146,7 @@ class GitHubRepoHandler(GithubClientMixin, BaseHandler):
 
     async def get(self, user, repo):
         response = await self.github_client.get_repo(user, repo)
-        default_branch = json.loads(response_text(response))['default_branch']
+        default_branch = json.loads(response_text(response))["default_branch"]
 
         new_url = self.from_base(
             "/", self.format_prefix, "github", user, repo, "tree", default_branch