Unable to get value from SHT-31

[matsujirushi]

The sunlight sensor is connected to I2C0, and the SHT-31 is connected to I2C1.
When I try to get the humidity of SHT-31, I get an "unknown reason" error.

[matsujirushi]

It seems that multiple I2C buses cannot be used at the same time because SDA and SCL are static variables.

https://github.com/Seeed-Studio/Wio_Link/blob/master/esp8266_arduino/Wire.cpp#L58
https://github.com/Seeed-Studio/Wio_Link/blob/master/esp8266_arduino/core_esp8266_si2c.c#L64
https://github.com/Seeed-Studio/Wio_Link/blob/master/esp8266_arduino/core_esp8266_si2c.c#L26

The latest version of Arduino core for ESP8266 seems to correct this.

https://github.com/esp8266/Arduino/blob/master/cores/esp8266/core_esp8266_si2c.cpp#L67