newer ccs811 sensors come without NTC

[goutham2688]

• Arduino board: Feather Huzzah

• Arduino IDE version (found in Arduino -> About Arduino menu): 2.0.3

• List the steps to reproduce the problem below (if possible attach a sketch or
  copy the sketch code in too):
  i followed the ccs811 example sketch and saw several errors, on "ccs.readData",
  and ultimately found the root cause as "ccs.calculateTemperature" function creating errors,
  commenting the calculate temperature function seems to resolve the issues.

per the datasheet link seems like the the 0x06 register read by the calculateTemperature function is not documented.

newer version of ccs811 does not have NTC in them, I suppose you can add a comment in examples to remove the "calculateTemperature" function if they're facing errors.

thanks for making this library, it was very easy to use and easy to understand :)