add lnd 0.18.0 to lnd updates

Author: openoms

hardware/raspiblitz/lnd.updates.md

@@ -18,6 +18,19 @@ Before updating it is recommended to make a full backup of the LND directory.
 
   More info about this process in the [FAQ](https://github.com/raspiblitz/raspiblitz/blob/dev/FAQ.md#2-making-a-complete-lnd-data-backup)
 
+## [Update LND to v0.18.0-beta](https://github.com/openoms/lightning-node-management/tree/en/lnd.updates/lnd.update.v0.18.0-beta.sh)
+
+* Run in the RaspiBlitz terminal to use:
+
+  ```bash
+    # download
+    wget https://raw.githubusercontent.com/openoms/lightning-node-management/en/lnd.updates/lnd.update.v0.18.0-beta.sh
+    # look through the script
+    cat lnd.update.v0.18.0-beta.sh
+    # run
+    bash lnd.update.v0.18.0-beta.sh
+  ```
+
 ## [Update LND to v0.17.4-beta](https://github.com/openoms/lightning-node-management/tree/en/lnd.updates/lnd.update.v0.17.4-beta.sh)
 
 * Run in the RaspiBlitz terminal to use: