Bump rack from 1.5.2 to 1.5.5 in /presentations/join-the-ruby-line/todo#27

dependabot[bot] wants to merge 1 commit intomasterinformatom/informatom.com:masterfrom

dependabot/bundler/presentations/join-the-ruby-line/todo/rack-1.5.5informatom/informatom.com:dependabot/bundler/presentations/join-the-ruby-line/todo/rack-1.5.5Copy head branch name to clipboard