Update README.md

Author: lcreid

README.md

@@ -13,8 +13,8 @@ If you're just looking for Bootstrap markup on your Devise views, and don't want
 Add these lines to your application's `Gemfile`:
 
 ```ruby
-gem 'bootstrap', '~> 4.0'
-gem "bootstrap_form", "~> 4.0"
+gem 'bootstrap', '~> 5.0'
+gem "bootstrap_form", "~> 5.0"
 gem 'devise'
 # gem 'devise-i18n'
 # gem 'devise_invitable'