Include Git branch in zsh prompt

.zshrc

#  
# Prompt customisation for Git branch
#

# Use colors module for simpler usage of colours in prompt
autoload -U colors && colors

# Use vcs_info module for getting Git info (see https://arjanvandergaag.nl/blog/customize-zsh-prompt-with-vcs-info.html)
autoload -Uz vcs_info

# Tell vcs_info to output the current branch, if on a Git repo
zstyle ':vcs_info:git*' formats "%{$fg_bold[cyan]%}(%b)%{$reset_color%}"

# Tell zsh to run vcs_info before every command to update the prompt
precmd() {
    vcs_info
}

# Tell zsh to substitute variables in prompt
setopt prompt_subst

# Finally, update the prompt! %{...%} escape non-printable chars, otherwise line wrapping can mess up
# (See http://zsh.sourceforge.net/Doc/Release/Prompt-Expansion.html#Prompt-Expansion)
PROMPT='%{$fg[magenta]%}%n@%m%{$reset_color%} %{$fg[white]%}%1~%{$reset_color%} ${vcs_info_msg_0_} %# '