Add note on updating participation keys.

Author: hsoerensen

README.md

@@ -50,6 +50,15 @@ export VOINETWORK_SKIP_WALLET_SETUP=1
 /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/VoiNetwork/docker-swarm/main/install.sh)"
 ```
 
+## Updating Participation Key
+
+If you need to renew your participation key simple rerun the installation script. The script will automatically generate
+new participation keys if existing keys have duration less than 14 days.
+
+```bash
+/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/VoiNetwork/docker-swarm/main/install.sh)"
+```
+
 ## Setting a Custom Telemetry Name
 
 To set a custom telemetry name, set the VOINETWORK_TELEMETRY_NAME environment variable to your desired name: