disperse: Remove unnecessary options.

disperse.conf

@@ -3,12 +3,6 @@ news_file: "NEWS"
 timeout_days: 5
 tag_name: "dulwich-$VERSION"
 verify_command: "flake8 && make check"
-github_url: "https://github.com/dulwich/dulwich"
-update_version {
-  path: "setup.py"
-  match: "^dulwich_version_string = '(.*)'$"
-  new_line: "dulwich_version_string = '$VERSION'"
-}
 update_version {
   path: "dulwich/__init__.py"
   match: "^__version__ = \((.*)\)$"