Remove postgresql from list that Homebrew installs

1. This causes problems on Mojave
   (see petere/homebrew-postgresql#41)
2. Those who develop in Docker don't need it

provision_tools.sh

@@ -6,7 +6,7 @@
 #
 # Installing in home directory against the standard advice,
 # because we don't have access to their preferred location (/usr/local).
-echo 'CFPB Mac Setup !¡!¡! INSTALLING HOMEBREW ¡!¡!¡'
+echo '!¡!¡! CFPB Mac Setup !¡!¡! INSTALLING HOMEBREW ¡!¡!¡'
 mkdir $HOME/homebrew && curl -L https://github.com/Homebrew/brew/tarball/master | tar xz --strip 1 -C ~/homebrew
 
 ## Update path for this script to be able to access the brew command.
@@ -15,15 +15,15 @@ export PATH="${HOME}/homebrew/bin:${PATH}"
 
 # Install standard Brew formulae that most devs will need or want.
 # Git, in particular, give us a more modern version than what ships with macOS.
-echo 'CFPB Mac Setup !¡!¡! INSTALLING STANDARD BREW FORMULAE ¡!¡!¡'
+echo '!¡!¡! CFPB Mac Setup !¡!¡! INSTALLING STANDARD BREW FORMULAE ¡!¡!¡'
 echo '(This will take a while. Stretch your legs.)'
-brew install git git-secrets postgresql pyenv pyenv-virtualenvwrapper
+brew install git git-secrets pyenv pyenv-virtualenvwrapper
 
 
 # Set up Python stuff.
 # Following the instructions at:
 # https://github.com/cfpb/development/blob/master/guides/installing-python.md
-echo 'CFPB Mac Setup !¡!¡! INITIALIZING PYENV ¡!¡!¡'
+echo '!¡!¡! CFPB Mac Setup !¡!¡! INITIALIZING PYENV ¡!¡!¡'
 
 ## Export necessary environment variables for use in this script.
 export PYENV_ROOT="${HOME}/.pyenv"
@@ -35,11 +35,12 @@ if command -v pyenv 1>/dev/null 2>&1; then
 fi
 
 ## Install the versions of Python that we use.
-echo 'CFPB Mac Setup !¡!¡! INSTALLING PYTHON 3.6.8 & 2.7.15 ¡!¡!¡'
+echo '!¡!¡! CFPB Mac Setup !¡!¡! INSTALLING PYTHON 3.6.9 AND 2.7.16 ¡!¡!¡'
 pyenv install 3.6.9
 pyenv install 2.7.16
 
 ## Set the global Python versions.
+echo '!¡!¡! CFPB Mac Setup !¡!¡! SETTING GLOBAL PYTHON VERSIONS ¡!¡!¡'
 echo '(This will make `python` version 3.6.9, and `python2` will be 2.7.16.)'
 pyenv global 3.6.9 2.7.16
 
@@ -49,7 +50,7 @@ pyenv virtualenvwrapper_lazy
 
 # Install NVM (Node Version Manager).
 # https://github.com/nvm-sh/nvm
-echo 'CFPB Mac Setup !¡!¡! INSTALLING NVM ¡!¡!¡'
+echo '!¡!¡! CFPB Mac Setup !¡!¡! INSTALLING NVM ¡!¡!¡'
 curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.34.0/install.sh | bash
 
 ## Export necessary environment variable for use in this script.
@@ -61,35 +62,39 @@ if [ -s "$NVM_DIR/nvm.sh" ]; then
 fi
 
 # Install the latest LTS (long-term support) release of Node and activate it.
-echo 'CFPB Mac Setup !¡!¡! INSTALLING NODE ¡!¡!¡'
+echo '!¡!¡! CFPB Mac Setup !¡!¡! INSTALLING NODE ¡!¡!¡'
 nvm install lts/*
 
 
 # Install the Yarn package manager.
 # https://yarnpkg.com/
 #
 # This will automatically add it to the PATH by appending .bashrc.
-echo 'CFPB Mac Setup !¡!¡! INSTALLING YARN ¡!¡!¡'
+echo '!¡!¡! CFPB Mac Setup !¡!¡! INSTALLING YARN ¡!¡!¡'
 curl -o- -L https://yarnpkg.com/install.sh | bash
 
 # Install global Node packages.
-echo 'CFPB Mac Setup !¡!¡! INSTALLING GLOBAL NODE PACKAGES ¡!¡!¡'
+echo '!¡!¡! CFPB Mac Setup !¡!¡! INSTALLING GLOBAL NODE PACKAGES ¡!¡!¡'
 yarn global add yo generator-cf generator-node snyk
 
 
 # Apply standard dotfiles, backing up existing files if present.
-echo 'CFPB Mac Setup !¡!¡! CREATING STANDARD DOTFILES ¡!¡!¡'
+echo '!¡!¡! CFPB Mac Setup !¡!¡! CREATING STANDARD DOTFILES ¡!¡!¡'
 echo 'Note: Existing files will be backed up in the same location with a suffix of the date.'
 rsync -abq --suffix=_`date +"%Y%m%d_%H%M"` ./dotfiles/ $HOME/
 
 
 # Install git-secrets hooks.
 # https://github.com/awslabs/git-secrets
-echo 'CFPB Mac Setup !¡!¡! INSTALLING GIT-SECRETS ¡!¡!¡'
+echo '!¡!¡! CFPB Mac Setup !¡!¡! INSTALLING GIT-SECRETS ¡!¡!¡'
 git secrets --install $HOME/.git-templates/git-secrets
 git config --global init.templateDir $HOME/.git-templates/git-secrets
 git secrets  --add-provider -- egrep -v '^$|^#' $HOME/.secret_patterns
 
 
 # Add global Git config for .gitmessage.
 git config --global commit.template $HOME/.gitmessage
+
+
+echo '!¡!¡! CFPB Mac Setup !¡!¡! SETUP COMPLETE! ¡!¡!¡'
+echo 'Be sure to `source ~./bashrc` or open a new terminal window.'