remove comment that was tripping Travis CI

Author: ctk21

codespeed/commits/github.py

@@ -66,8 +66,6 @@ def retrieve_tag(commit_id, username, project):
     tags_url = 'https://api.github.com/repos/%s/%s/git/refs/tags' % (
         username, project)
 
-    ## TODO: This might not do what is intended
-    ##   the tag SHA isn't the same thing as the commit it points
     tags_json = fetch_json(tags_url)
     for tag in tags_json:
         if tag['object']['sha'] == commit_id: