README.dist.md dependency updates: Homebrew and Git.

[damontgomery]

When walking this through with outside developers, we needed to install homebrew and configure Git for this to work.

https://brew.sh/

brew cask install vagrant virtualbox
brew install composer ansible

https://help.github.com/en/articles/setting-your-username-in-git
https://help.github.com/en/articles/setting-your-commit-email-address-in-git

git config --global user.name "John Smith"
git config --global user.email "email@example.com"

We encountered vagrant up failing if a local Git configuration wasn't created since it tries to copy it.

[damontgomery]

I added this to a project:

Short list of commands for a new environment

# Install Homebrew.
/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

# Install depedencies.
brew cask install vagrant virtualbox
brew install composer ansible
vagrant plugin install vagrant-hostmanager vagrant-auto_network

# Configure Git with your name and email.
git config --global user.name "John Smith"
git config --global user.email "email@example.com"