Update to v5.0.0

1. Updater: Add `util/backdrop.js` to the list of inlined srcs.
2. `bundle exec rake 'update[v5.0.0]'
3. Update version numbers.
4. Bump minimum Popper version from 2.9.1 to 2.9.2

Author: glebm

README.md

@@ -20,7 +20,7 @@ Please see the appropriate guide for your environment of choice:
 Add `bootstrap` to your Gemfile:
 
 ```ruby
-gem 'bootstrap', '~> 5.0.0.beta3'
+gem 'bootstrap', '~> 5.0.0'
 ```
 
 Ensure that `sprockets-rails` is at least v2.3.2.

assets/javascripts/bootstrap-sprockets.js

@@ -1,7 +1,7 @@
 //= require ./bootstrap-global-this-define
 //= require ./bootstrap/dom/data
-//= require ./bootstrap/base-component
 //= require ./bootstrap/dom/event-handler
+//= require ./bootstrap/base-component
 //= require ./bootstrap/alert
 //= require ./bootstrap/button
 //= require ./bootstrap/dom/manipulator