def filter_by_tag(issues, newer_tag = nil)
      issues.select do |issue|
        issue["first_occurring_tag"] == (newer_tag.nil? ? nil : newer_tag["name"])
      end
    end
def filter_by_tag(issues, newer_tag = nil)
      issues.select do |issue|
        issue["first_occurring_tag"] == (newer_tag.nil? ? nil : newer_tag["name"])
      end
    end
Method filter issues, that belong only specified tag range

 @param [Array] issues issues to filter
 @param [Hash, Nil] newer_tag Tag to find PRs of. May be nil for unreleased section
 @return [Array] filtered issues