update-homebrewalt-version

### Changelog
* updated homebrew version to 1.8.7
https://trello.com/c/evcXQD4t/334-update-kitchenplan-config-to-fix-homeb
rew-installation-process

* pull request on homebrewalt repo : https://github.com/kitchenplan/chef-homebrewalt/pull/13