Update 05.2.md
Update 05.2.md

typo of package name
astaxie/build-web-application-with-golang,astaxie/build-web-application-with-golang,admpub/build-web-application-with-golang,songqii/build-web-application-with-golang,songqii/build-web-application-with-golang,faxriddin/build-web-application-with-golang,admpub/build-web-application-with-golang,admpub/build-web-application-with-golang,admpub/build-web-application-with-golang,faxriddin/build-web-application-with-golang,astaxie/build-web-application-with-golang,WangKaimin/build-web-application-with-golang,WangKaimin/build-web-application-with-golang