main.h: added include coexist.h

include/main.h

@@ -4,6 +4,7 @@
 #include <esp_spi_flash.h>   // needed for reading ESP32 chip attributes
 #include <esp_event_loop.h>  // needed for Wifi event handler
 #include <esp32-hal-timer.h> // needed for timers
+#include <esp_coexist.h>     // needed for coex version display
 
 #include "globals.h"
 #include "reset.h"