Update .travis.yml
Update .travis.yml

rtaudio is not longer required, but cmake in a newer version
Kaayy-J/OHMComm-Light,Kaayy-J/OHMComm-Light,Kaayy-J/OHMComm-Light,Kaayy-J/OHMComm-Light,Kaayy-J/OHMComm-Light,doe300/OHMComm,doe300/OHMComm,Kaayy-J/OHMComm-Light