add default values for updateSpiffs

Author: Links2004

libraries/ESP8266httpUpdate/src/ESP8266httpUpdate.h

@@ -53,7 +53,7 @@ class ESP8266HTTPUpdate {
         t_httpUpdate_return update(const char * host, uint16_t port, const char * url = "/", const char * current_version = "", bool https = false, const char * httpsFingerprint = "");
         t_httpUpdate_return update(String host, uint16_t port, String url = "/", String current_version = "", bool https = false, String httpsFingerprint = "");
 
-        t_httpUpdate_return updateSpiffs(const char * url, const char * current_version, const char * httpsFingerprint);
+        t_httpUpdate_return updateSpiffs(const char * url, const char * current_version = "", const char * httpsFingerprint = "");
 
     protected:
         t_httpUpdate_return handleUpdate(HTTPClient * http, const char * current_version, bool reboot = true, bool spiffs = false);