auto shutdown thinknode m1 at 3.3v

Author: liamcottle

variants/thinknode_m1/platformio.ini

@@ -77,6 +77,7 @@ build_flags =
   -D DISPLAY_CLASS=GxEPDDisplay
   -D OFFLINE_QUEUE_SIZE=256
   -D PIN_BUZZER=6
+  -D AUTO_SHUTDOWN_MILLIVOLTS=3300
 ;  -D MESH_PACKET_LOGGING=1
 ;  -D MESH_DEBUG=1
 build_src_filter = ${ThinkNode_M1.build_src_filter}