prhub 0.1.4

Fixed

• Polls no longer slow down with many watched commits after a deploy. The run behind a later commit's deploy was asked
  once per watched commit it might contain, every poll (46 requests for 11 runs, polls of up to 200 s, seen on the
  maintainer's machine 14/10 with about 100 watched commits and 60 open PRs). It is now asked at most once per poll, shared through
  runs.json; a successful run is remembered, and one that ended badly is asked again every 10 minutes.