Update README.md

To set a good example.

Author: arnested

README.md

@@ -39,7 +39,7 @@ name: GitHub Security Alerts for Jira
 
 on:
   schedule:
-    - cron: '*/15 * * * *'
+    - cron: '0 */6 * * *'
 
 jobs:
   syncSecurityAlerts:
@@ -74,4 +74,4 @@ After that, you can execute the Symfony console app like so:
 docker-compose run --rm ghsec-jira --verbose --dry-run
 ```
 
-Remove the `--dry-run` option to actually create issues in Jira.
+Remove the `--dry-run` option to actually create issues in Jira.