recognize zsh-themes as zsh filetypes
## Syntax highlighting for ZSH scripts (initially copied from sh.nanorc)
-syntax "zsh" "\.zsh$" "\.?(zshenv|zprofile|zshrc|zlogin|zlogout)$"
+syntax "zsh" "\.zsh$" "\.?(zshenv|zprofile|zshrc|zlogin|zlogout|zsh-theme)$"
header "^#!.*/(env +)?zsh( |$)"
## Numbers
