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/D8338

.arcconfig

@@ -1,11 +1,9 @@
 {
-  "project_id" : "phabricator",
-  "conduit_uri" : "https://secure.phabricator.com/api/",
+  "project.name" : "phabricator",
+  "phabricator.uri" : "https://secure.phabricator.com/",
   "lint.engine" : "PhabricatorLintEngine",
   "unit.engine" : "PhutilUnitTestEngine",
-  "phutil_libraries" : {
-    "phabricator" : "src/"
-  },
+  "load" : ["src/"],
   "lint.xhpast.naminghook" : "PhabricatorSymbolNameLinter",
   "lint.jshint.config" : "support/jshint/jshintconfig"
 }