patchbomb: don't close unused progress topic
The "writing" topic has not been used since 1830d0cc4bc1 (patchbomb:
minor refactoring of mbox functionality, preparing for move,
2011-11-23).
Differential Revision: https://phab.mercurial-scm.org/D3803
# name space package to host third party extensions
from __future__ import absolute_import
import pkgutil
__path__ = pkgutil.extend_path(__path__, __name__)