ci(travis): split global installs
ci(travis): split global installs

OzTK/elm-express-boilerplate,OzTK/elm-express-typescript-webpack-boilerplate,OzTK/elm-express-boilerplate,OzTK/elm-express-boilerplate,OzTK/elm-express-typescript-webpack-boilerplate,OzTK/elm-express-typescript-webpack-boilerplate