178724803 -- Update webmock to 3.13.0
178724803 -- Update webmock to 3.13.0

Fixes `unknown keyword: :write_timeout` errors

#178724803
https://www.pivotaltracker.com/story/show/178724803

concord-consortium/rigse,concord-consortium/rigse,concord-consortium/rigse,concord-consortium/rigse,concord-consortium/rigse,concord-consortium/rigse