[Fix #311] zsh/presto gets "modified" after clean install
adding brew update
follow presentation style
Merge pull request #359 from victormours/adding-brew-update

Adding brew update to Rakefile
Merge pull request #357 from nandalopes/fix-311-dirty-worktree

[Fix #311] zsh/presto gets "modified" after clean install
Merge remote-tracking branch 'skwp/master'