Fix code that generates AssemblyInfo.cs so that it generates it with UTF-8 encoding
Fix code that generates AssemblyInfo.cs so that it generates it with UTF-8 encoding

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