Update bundler requirement from ~> 1.16 to ~> 2.0#4

dependabot-preview[bot] wants to merge 1 commit intomasterCoffeeAndCode/rubocop_method_order:masterfrom

dependabot/bundler/bundler-tw-2.0CoffeeAndCode/rubocop_method_order:dependabot/bundler/bundler-tw-2.0Copy head branch name to clipboard