travis.yml: Only build master and develop on push
travis.yml: Only build master and develop on push

lgarren/spack,krafczyk/spack,TheTimmy/spack,skosukhin/spack,matthiasdiener/spack,mfherbst/spack,matthiasdiener/spack,LLNL/spack,EmreAtes/spack,EmreAtes/spack,lgarren/spack,skosukhin/spack,EmreAtes/spack,TheTimmy/spack,LLNL/spack,EmreAtes/spack,lgarren/spack,krafczyk/spack,iulian787/spack,tmerrick1/spack,tmerrick1/spack,matthiasdiener/spack,tmerrick1/spack,mfherbst/spack,iulian787/spack,tmerrick1/spack,TheTimmy/spack,skosukhin/spack,iulian787/spack,skosukhin/spack,mfherbst/spack,lgarren/spack,matthiasdiener/spack,TheTimmy/spack,matthiasdiener/spack,skosukhin/spack,krafczyk/spack,LLNL/spack,krafczyk/spack,EmreAtes/spack,LLNL/spack,lgarren/spack,mfherbst/spack,tmerrick1/spack,iulian787/spack,mfherbst/spack,LLNL/spack,TheTimmy/spack,krafczyk/spack,iulian787/spack