fix adafruit#918

Add stub for common_hal_pulseio_pulsein_get_paused  to make ESP8266 build compatible with PR adafruit#901

Author: jerryneedell

ports/esp8266/common-hal/pulseio/PulseIn.c

@@ -62,6 +62,10 @@ uint16_t common_hal_pulseio_pulsein_get_maxlen(pulseio_pulsein_obj_t* self) {
     return 0;
 }
 
+bool common_hal_pulseio_pulsein_get_paused(pulseio_pulsein_obj_t* self) {
+    return true;
+}
+
 uint16_t common_hal_pulseio_pulsein_get_len(pulseio_pulsein_obj_t* self) {
     return 0;
 }