Update RFC 1068 recommended PR URL

Author: Ember.js RFCS CI

text/1068-tracked-collections.md

@@ -12,6 +12,7 @@ prs:
   accepted: 'https://github.com/emberjs/rfcs/pull/1068'
   ready-for-release: 'https://github.com/emberjs/rfcs/pull/1088'
   released: 'https://github.com/emberjs/rfcs/pull/1146'
+  recommended: 'https://github.com/emberjs/rfcs/pull/1149'
 project-link:
 suite:
 ---