[travis] fix .travis.yml
[travis] fix .travis.yml

jjffryan/pymtl,cfelton/pymtl,jjffryan/pymtl,jck/pymtl,Glyfina-Fernando/pymtl,cornell-brg/pymtl,jck/pymtl,tj93/pymtl,12yujim/pymtl,jck/pymtl,cfelton/pymtl,cfelton/pymtl,12yujim/pymtl,cornell-brg/pymtl,cornell-brg/pymtl,tj93/pymtl,jjffryan/pymtl,tj93/pymtl,Glyfina-Fernando/pymtl,12yujim/pymtl,Glyfina-Fernando/pymtl