Update 09.6.md
Update 09.6.md

remove base64 encode/decode subsection and modify several bad translations.
admpub/build-web-application-with-golang,WangKaimin/build-web-application-with-golang,astaxie/build-web-application-with-golang,astaxie/build-web-application-with-golang,astaxie/build-web-application-with-golang,admpub/build-web-application-with-golang,songqii/build-web-application-with-golang,admpub/build-web-application-with-golang,faxriddin/build-web-application-with-golang,songqii/build-web-application-with-golang,WangKaimin/build-web-application-with-golang,faxriddin/build-web-application-with-golang,admpub/build-web-application-with-golang