Add nodes to sample config

sample_config.yaml

@@ -3,15 +3,15 @@ matrix:
   access_token: "reaalllllyloooooongsecretttttcodeeeeeeforrrrbot" # See: https://t2bot.io/docs/access_tokens/
   bot_user_id: "@botuser:example.matrix.org"
 
-matrix_rooms:  # Needs at least 1 room & channel, but supports all Meshtastic channels
+matrix_rooms: # Needs at least 1 room & channel, but supports all Meshtastic channels
   - id: "#someroomalias:example.matrix.org" # Matrix room aliases & IDs supported
     meshtastic_channel: 0
   - id: "!someroomid:example.matrix.org"
     meshtastic_channel: 2
 
 meshtastic:
-  connection_type: serial  # Choose either "network" or "serial"
-  serial_port: /dev/ttyUSB0  # Only used when connection is "serial"
+  connection_type: serial # Choose either "network" or "serial"
+  serial_port: /dev/ttyUSB0 # Only used when connection is "serial"
   host: "meshtastic.local" # Only used when connection is "network"
   meshnet_name: "Your Meshnet Name" # This is displayed in full on Matrix, but is truncated when sent to a Meshnet
   broadcast_enabled: true
@@ -19,8 +19,10 @@ meshtastic:
 logging:
   level: "info"
 
-plugins:  # Optional plugins
+plugins: # Optional plugins
   health:
     active: true
   map:
-    active: true
+    active: true
+  nodes:
+    active: true