def with_impact(line_count)
      support! :line_stats

      commits = CommitCollection.new
      each do |commit|
        commits << commit if commit.modifications >= line_count
      end
      commits
    end
def with_impact(line_count)
      support! :line_stats

      commits = CommitCollection.new
      each do |commit|
        commits << commit if commit.modifications >= line_count
      end
      commits
    end
Returns the commits in this collection that change at least the given
 number of lines

 @param [Numeric] line_count The number of lines that should be
        changed at least by the commits
 @return [CommitCollection] The commits that change at least the given
         number of lines
 @see Commit#modifications