Update README.md

- Changelog update
- Added item to roadmap

README.md

@@ -78,6 +78,7 @@ However you can update it manually by running the script and choose "Update the
 
 ## Roadmap
 
+- Use systemd service if available. If not, set cronjob
 - Reinstall function
 - Easier way to disable auto-update function
 - Verify that the root's cron is enabled or not
@@ -86,6 +87,10 @@ However you can update it manually by running the script and choose "Update the
 
 ## Changelog
 
+>26-06-2023
+- Use *command -v* instead of *which*
+- Code simplification
+
 >14-03-2023
 - Fix bug [#9](https://github.com/Feriman22/portscan-protection/issues/9)