.travis.yml: Add before_script
.travis.yml: Add before_script

rwhogg/brew,hanxue/linuxbrew,Linuxbrew/brew,rwhogg/brew,maxim-belkin/brew,Linuxbrew/brew,rwhogg/brew,Linuxbrew/brew,hanxue/linuxbrew,Linuxbrew/brew,hanxue/linuxbrew,maxim-belkin/brew,maxim-belkin/brew