def diff(old_commit, new_commit)
        stats = @g.diff(old_commit, new_commit).stats
        lines = lines_added(new_commit.sha)
        return if !lines.is_a?(Hash) || stats.blank?

        lines.each do |filename, filelines|
          stats[:files][filename][:lines_added] = filelines if stats[:files].key?(filename)
        end

        stats
      end
def diff(old_commit, new_commit)
        stats = @g.diff(old_commit, new_commit).stats
        lines = lines_added(new_commit.sha)
        return if !lines.is_a?(Hash) || stats.blank?

        lines.each do |filename, filelines|
          stats[:files][filename][:lines_added] = filelines if stats[:files].key?(filename)
        end

        stats
      end
Get general stats of commit on HEAD versus last commit on master branch
 @modified 0.1.4
 @param old_commit [Git::Object]
 @param new_commit [Git::Object]
 @return [Git::Diff] hash of abbreviated, useful stats with added lines