(maint) - remove changelog generator rake task

Rakefile

@@ -39,24 +39,3 @@ namespace :spec do
 
   task :unit => :spec_prep
 end
-
-#### CHANGELOG ####
-begin
-  require 'github_changelog_generator/task'
-  GitHubChangelogGenerator::RakeTask.new :changelog do |config|
-    require 'puppet/resource_api/version'
-    config.future_release = "#{Puppet::ResourceApi::VERSION}"
-    config.header = "# Changelog\n\n" \
-      "All significant changes to this repo will be summarized in this file.\n"
-    # config.include_labels = %w[enhancement bug]
-    config.exclude_labels = %w{duplicate question invalid wontfix wont-fix skip-changelog}
-    config.user = 'puppetlabs'
-    config.project = 'puppet-resource_api'
-    config.exclude_tags = ['v1.8.14']
-  end
-rescue LoadError
-  desc 'Install github_changelog_generator to get access to automatic changelog generation'
-  task :changelog do
-    raise 'Install github_changelog_generator to get access to automatic changelog generation'
-  end
-end