Generating entry...
Traceback (most recent call last):
	15: from /Users/x/.rbenv/versions/2.5.1/bin/github_changelog_generator:23:in `<main>'
	14: from /Users/x/.rbenv/versions/2.5.1/bin/github_changelog_generator:23:in `load'
	13: from /Users/x/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/github_changelog_generator-1.15.0/bin/github_changelog_generator:5:in `<top (required)>'
	12: from /Users/x/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/github_changelog_generator-1.15.0/lib/github_changelog_generator.rb:35:in `run'
	11: from /Users/x/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/github_changelog_generator-1.15.0/lib/github_changelog_generator/generator/generator.rb:56:in `compound_changelog'
	10: from /Users/x/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/github_changelog_generator-1.15.0/lib/github_changelog_generator/generator/generator.rb:121:in `generate_entries_for_all_tags'
	 9: from /Users/x/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/github_changelog_generator-1.15.0/lib/github_changelog_generator/generator/generator.rb:121:in `each_pair'
	 8: from /Users/x/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/github_changelog_generator-1.15.0/lib/github_changelog_generator/generator/generator.rb:123:in `block in generate_entries_for_all_tags'
	 7: from /Users/x/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/github_changelog_generator-1.15.0/lib/github_changelog_generator/generator/generator.rb:92:in `generate_entry_between_tags'
	 6: from /Users/x/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/github_changelog_generator-1.15.0/lib/github_changelog_generator/generator/entry.rb:39:in `generate_entry_for_tag'
	 5: from /Users/x/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/github_changelog_generator-1.15.0/lib/github_changelog_generator/generator/entry.rb:120:in `generate_body'
	 4: from /Users/x/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/github_changelog_generator-1.15.0/lib/github_changelog_generator/generator/entry.rb:120:in `map'
	 3: from /Users/x/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/github_changelog_generator-1.15.0/lib/github_changelog_generator/generator/section.rb:29:in `generate_content'
	 2: from /Users/x/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/github_changelog_generator-1.15.0/lib/github_changelog_generator/generator/section.rb:29:in `each'
	 1: from /Users/x/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/github_changelog_generator-1.15.0/lib/github_changelog_generator/generator/section.rb:30:in `block in generate_content'
/Users/x/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/github_changelog_generator-1.15.0/lib/github_changelog_generator/generator/section.rb:52:in `get_string_for_issue': undefined method `line_labels_for' for #<GitHubChangelogGenerator::Section:0x00007fee005b8240> (NoMethodError)

ruby -v
ruby 2.5.1p57 (2018-03-29 revision 63029) [x86_64-darwin19]

gem -v
2.7.6