remove assert

Author: Carreau

nbviewer/providers/github/client.py

@@ -44,7 +44,6 @@ def authenticate(self):
 
     def fetch(self, url, params=None, **kwargs):
         """Add GitHub auth to self.client.fetch"""
-        assert False
         if not url.startswith(self.github_api_url):
             raise ValueError("Only fetch GitHub urls with GitHub auth (%s)" % url)
         params = {} if params is None else params