tests: add zsh 5.4.2
tests: add zsh 5.4.2

P71/zsh-syntax-highlighting,danielshahaf/zsh-syntax-highlighting,joshuarubin/dotfiles,zsh-users/zsh-syntax-highlighting,joshuarubin/dotfiles,zsh-users/zsh-syntax-highlighting,danielshahaf/zsh-syntax-highlighting,stuha/wbr-zsh,phy1729/zsh-syntax-highlighting,joshuarubin/dotfiles,joshuarubin/dotfiles,phy1729/zsh-syntax-highlighting,x-way/zsh-syntax-highlighting,P71/zsh-syntax-highlighting,x-way/zsh-syntax-highlighting