Error in readme

[MKme]

Should be error_code not error code I think. Cheers ****

esp32FOTA.setUpdateCheckFailCb( [](int partition, int error code) { Serial.printf("Update could validate %s partition (error %d)\n", partition==U_SPIFFS ? "spiffs" : "firmware", error_code ); // error codes: // -1 : partition not found // -2 : validation (signature check) failed });

[jnsdrssn]

https://github.com/chrisjoyce911/esp32FOTA/pull/127