Update mullvad-vpn-beta to 2018.2-beta2 (#6033)
Update mullvad-vpn-beta to 2018.2-beta2 (#6033)


Ngrd/homebrew-versions,pkq/homebrew-versions,mahori/homebrew-cask-versions,404NetworkError/homebrew-versions,404NetworkError/homebrew-versions,lantrix/homebrew-versions,mahori/homebrew-versions,caskroom/homebrew-versions,caskroom/homebrew-versions,victorpopkov/homebrew-versions,Ngrd/homebrew-versions,victorpopkov/homebrew-versions,rogeriopradoj/homebrew-versions,rogeriopradoj/homebrew-versions,lantrix/homebrew-versions,pkq/homebrew-versions