Add github_changelog_generator

Gemfile

@@ -1,2 +1,4 @@
 source "https://rubygems.org"
 gemspec
+
+gem "github_changelog_generator", "~> 1.16"

Rakefile

@@ -13,3 +13,14 @@ Rake::TestTask.new(:test) do |t|
 end
 
 task default: :test
+
+require "github_changelog_generator/task"
+require "alchemy/sentry/version"
+
+namespace :changelog do
+  GitHubChangelogGenerator::RakeTask.new :update do |config|
+    config.user = "AlchemyCMS"
+    config.project = "alchemy-sentry"
+    config.future_release = "v#{Alchemy::Sentry::VERSION}"
+  end
+end