let's NOT use charts for a number example as numbers does not support…

… OOXML charts yet!

README.md

@@ -213,17 +213,13 @@ related to themes, which axlsx does not implement at this time.
      conveniently done just before rendering by calling Package.use_shared_strings = true prior to serialization.
 
 ```ruby
-Axlsx::Package.new do |p|
-  p.workbook.add_worksheet(:name => "Pie Chart") do |sheet|
-    sheet.add_row ["Simple Pie Chart"]
-    %w(first second third).each { |label| sheet.add_row [label, rand(24)+1] }
-    sheet.add_chart(Axlsx::Pie3DChart, :start_at => [0,5], :end_at => [10, 20], :title => "example 3: Pie Chart") do |chart|
-      chart.add_series :data => sheet["B2:B4"], :labels => sheet["A2:A4"],  :colors => ['FF0000', '00FF00', '0000FF']
-    end
-  end
-  p.use_shared_strings = true
-  p.serialize('simple.xlsx')
+p = Axlsx::Package.new
+p.workbook.add_worksheet(:name => "Basic Worksheet") do |sheet|
+  sheet.add_row ["First Column", "Second", "Third"]
+  sheet.add_row [1, 2, 3]
 end
+p.use_shared_strings = true
+p.serialize('simple.xlsx')
 ```
 
    - charts do not render