changelog: Update for changes pulled out of 0.5.x.
changelog: Update for changes pulled out of 0.5.x.

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