Update github_changelog_generator requirement from 1.16.2 to 1.16.4 (#55)

dependabot[bot] · web-flow · commit 12b268c60997 · 2021-06-03T18:14:07.000Z
diff --git a/Gemfile b/Gemfile
@@ -1,3 +1,3 @@
 source 'https://rubygems.org' do
-  gem 'github_changelog_generator', '1.16.2'
+  gem 'github_changelog_generator', '1.16.4'
 end
