Bump to v5.0.0.alpha1

Author: glebm

README.md

@@ -17,7 +17,7 @@ Please see the appropriate guide for your environment of choice:
 Add `bootstrap` to your Gemfile:
 
 ```ruby
-gem 'bootstrap', '~> 4.5.2'
+gem 'bootstrap', '~> 5.0.0.alpha1'
 ```
 
 Ensure that `sprockets-rails` is at least v2.3.2.

lib/bootstrap/version.rb

@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
 module Bootstrap
-  VERSION       = '4.5.2'
+  VERSION       = '5.0.0.alpha1'
   BOOTSTRAP_SHA = 'a1708ec2a38d331c4c9eacac08ce9c9839649476'
 end