hardwareSerial: add missing include (#5648)

d-a-v · earlephilhower · commit 471dd87b5c37 · 2019-01-21T16:32:17.000Z
Fix #5644, #include <time.h>
diff --git a/cores/esp8266/HardwareSerial.h b/cores/esp8266/HardwareSerial.h
@@ -28,6 +28,7 @@
 #define HardwareSerial_h
 
 #include <inttypes.h>
+#include <time.h>
 #include "Stream.h"
 #include "uart.h"
 
