Changes to .zshrc makes it impossible to git pull in config.json

I see that the feature modified my `~/.zshrc` (symlinked to `~/.dotfiles/.zshrc`).

That makes my script

```
"scripts": [
    "if [ ! -d $HOME/.dotfiles ]; then git clone https://github.com/faximan/.dotfiles.git $HOME/.dotfiles; fi",
    "git -C $HOME/.dotfiles pull"
]
```

fail, because I cannot pull with a dirty state.