Update fixtures

Author: MartyEwings

.fixtures.yml

@@ -5,6 +5,7 @@ fixtures:
     package: "puppetlabs/package"
     reboot: "puppetlabs/reboot"
   repositories:
+    cron_core: "https://github.com/puppetlabs/puppetlabs-cron_core"
     facts: 'https://github.com/puppetlabs/puppetlabs-facts'
     puppet_agent: 'https://github.com/puppetlabs/puppetlabs-puppet_agent'
     provision: 'https://github.com/puppetlabs/provision'