Update README.md

Author: nseidle

README.md

@@ -21,6 +21,7 @@ Thanks to!
 * [bobobo1618](https://github.com/bobobo1618) for writing a CRC check and improving the return values of the library
 * [labeneator](https://github.com/labeneator) for adding method to disable calibrate at begin
 * [AndreasExner](https://github.com/AndreasExner) for adding [reset and getAutoSelfCalibration methods](https://github.com/sparkfun/SparkFun_SCD30_Arduino_Library/pull/17)
+* [awatterott](https://github.com/awatterott) for adding [getAltitudeCompensation()](https://github.com/sparkfun/SparkFun_SCD30_Arduino_Library/pull/18)
 
 Repository Contents
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