Bug when styling cells when Range ends in zero.

axlsx_bug.rb

require 'axlsx'
p = Axlsx::Package.new
wb = p.workbook
wb.styles do |s|
  head = s.add_style :bg_color => "00", :fg_color => "FF"
  wb.add_worksheet(:name => "Bug Example") do |sheet|
    sheet.add_row ['This row should not be styled','but it is']
    sheet.add_row ['The bug drops the trailing 0', 'so 10 -> 1']
    sheet.add_row ['I havent tested to 100 rows', 'so not sure there']
    sheet.add_row ['Row', '4']
    sheet.add_row ['Row', '5']
    sheet.add_row ['Row', '6']
    sheet.add_row ['Row', '7']
    sheet.add_row ['Row', '8']
    sheet.add_row ['Row', '9']
    sheet.add_row ['Row', '10']
    sheet.add_row ['Row', '11']
    sheet["A9:B9"].each {|c| c.style = head}
    sheet["A10:B10"].each {|c| c.style = head}
    sheet["A11:B11"].each{|c| c.style = head}
  end
end
p.serialize "range_bug.xlsx"