updated the readme.md file#1155

AyeSandarMin wants to merge 1 commit intoibm-developer-skills-network:mainibm-developer-skills-network/mcino-Introduction-to-Git-and-GitHub:mainfrom

AyeSandarMin:bug-fix-typoAyeSandarMin/mcino-Introduction-to-Git-and-GitHub:bug-fix-typoCopy head branch name to clipboard