Update font-awesome-sass requirement from ~> 4.7 to ~> 5.9

Updates the requirements on [font-awesome-sass](https://github.com/FortAwesome/font-awesome-sass) to permit the latest version.
- [Release notes](https://github.com/FortAwesome/font-awesome-sass/releases)
- [Commits](https://github.com/FortAwesome/font-awesome-sass/compare/4.7.0...5.9.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>
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dependabot-preview[bot] 2019-07-12 12:34:44 +00:00 committed by GitHub
commit db2cc601b7
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@ -6,4 +6,4 @@ gem "jekyll-assets", "~> 2.4.0", group: :jekyll_plugins
gem 'sprockets-es6' gem 'sprockets-es6'
gem "bootstrap", ">= 4.3.1" gem "bootstrap", ">= 4.3.1"
gem "font-awesome-sass", "~> 4.7" gem "font-awesome-sass", "~> 5.9"