Update to fix SPI transferBytes issue

earlephilhower · earlephilhower · commit ef2374ca57fe · 2019-01-27T20:25:32.000-08:00
See greiman/SdFat#125 (comment)
diff --git a/libraries/ESP8266SdFat b/libraries/ESP8266SdFat
@@ -1 +1 @@
-Subproject commit ff64b2daebf4cd9cc54908635d1c6f63dc4a82d1
+Subproject commit ab35142faa31d2086b4e0d07dd903c03f10fe0df
