v1.5 docs

docs/v1.4/Updates/update.md

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+# Updating 1.4 To Latest Version
+
+```{warning}
+If you use the XDP bridge, traffic will stop passing through the bridge during the update (XDP bridge is only operating while lqosd runs).
+```
+
+## If you installed with Git
+
+1. Change to your `LibreQoS` directory (e.g. `cd /opt/LibreQoS`)
+2. Update from Git: `git pull`
+3. Recompile: `./build-rust.sh`
+4. `sudo rust/remove_pinned_maps.sh`
+
+Run the following commands to reload the LibreQoS services.
+
+```shell
+sudo systemctl restart lqosd
+sudo systemctl restart lqos_node_manager
+sudo systemctl restart lqos_scheduler
+```
+
+## If you installed through the APT repository
+
+All you should have to do in this case is run `sudo apt update && sudo apt upgrade` and LibreQoS should install the new package.