Updated .arcconfig to match newer style configuration.
Summary: If I'm not mistaken, project_id was recently replaced by project.name and conduit_uri replaced by phabricator.uri.
Test Plan: I guess if this differential works, then everything is okay.
Reviewers: epriestley, #blessed_reviewers
Reviewed By: epriestley
CC: Korvin, epriestley, aran
Differential Revision: https://secure.phabricator.com/D8334