(maint) - Set max_issues for changelog generator to 500

Author: david22swan

Rakefile

@@ -53,6 +53,7 @@ if Bundler.rubygems.find_name('github_changelog_generator').any?
     config.header = "# Change log\n\nAll notable changes to this project will be documented in this file. The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/) and this project adheres to [Semantic Versioning](http://semver.org)."
     config.add_pr_wo_labels = true
     config.issues = false
+    config.max_issues = 500
     config.merge_prefix = "### UNCATEGORIZED PRS; LABEL THEM ON GITHUB"
     config.configure_sections = {
       "Changed" => {