dx: add .nvmrc file

[zacharygolba]

If you use nvm to manage Node versions and zsh (like Oh-My-ZSH), you can have nvm switch to the correct Node version automatically when you cd into this repository. To do so, add the following to your ~/.zshrc file:

# place this after nvm initialization!
autoload -U add-zsh-hook
load-nvmrc() {
  local node_version="$(nvm version)"
  local nvmrc_path="$(nvm_find_nvmrc)"

  if [ -n "$nvmrc_path" ]; then
    local nvmrc_node_version=$(nvm version "$(cat "${nvmrc_path}")")

    if [ "$nvmrc_node_version" != "N/A" ] && [ "$nvmrc_node_version" != "$node_version" ]; then
      nvm install
    fi
  elif [ "$node_version" != "$(nvm version default)" ]; then
    echo "Reverting to nvm default version"
    nvm use default
  fi
}
add-zsh-hook chpwd load-nvmrc
load-nvmrc

[codecov-io]

Current coverage is 92.28% (diff: 100%)

Merging #672 into master will not change coverage

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