Fix formatting of readme
Fix formatting of readme

EricWhiteDev/Open-XML-SDK,syediddi/Open-XML-SDK,KuPai32G/Open-XML-SDK,tarunchopra/Open-XML-SDK,JesseQin/Open-XML-SDK,tomjebo/Open-XML-SDK,syediddi/Open-XML-SDK,mimisasouvanh/Open-XML-SDK,modulexcite/Open-XML-SDK,KuPai32G/Open-XML-SDK,ThomasBarnekow/Open-XML-SDK,EricWhiteDev/Open-XML-SDK,ClareMSYanGit/Open-XML-SDK,OfficeDev/Open-XML-SDK,modulexcite/Open-XML-SDK