.travis.yml: added Python 3.5
.travis.yml: added Python 3.5

walshb/pyavroc,Byhiras/pyavroc,crs4/pyavroc,crs4/pyavroc,walshb/pyavroc,walshb/pyavroc,crs4/pyavroc,Byhiras/pyavroc,Byhiras/pyavroc,Byhiras/pyavroc,walshb/pyavroc