conflicting libraries ?
2.0 is needed to be up to date but some sensors such humidity and temperature DHT11 was in version 1.5.4, and no more present in 2.0 ==> working with two libraries isn't going to produce issues ? (conflicts)
Sketches that require third party libraries have been moved to https://github.com/mysensors/MySensorsArduinoExamples
Download and install that entire repository and you'll get the correct versions of the third party libraries (including DHT) as well.