Update rack requirement from ~> 1.5.2 to >= 1.5.2, < 2.1.0#5

dependabot[bot] wants to merge 1 commit intomasterportly/pairish:masterfrom

dependabot/bundler/rack-gte-1.5.2-and-lt-2.1.0portly/pairish:dependabot/bundler/rack-gte-1.5.2-and-lt-2.1.0Copy head branch name to clipboard