Error return RSSI is sint8

[Erriez]

According to the datasheet page 46, the function sint8 wifi_station_get_rssi(void); returns sint8, but return type in the library is int32_t:

Arduino/libraries/ESP8266WiFi/src/ESP8266WiFiSTA.cpp

Line 688 in bc2b13a

int32_t ESP8266WiFiSTAClass::RSSI(void) {

Proposal to change to:

int8_t ESP8266WiFiSTAClass::RSSI(void);