Updated footer in README file#1814

Cristian-Sal0217 wants to merge 1 commit intoibm-developer-skills-network:mainibm-developer-skills-network/mcino-Introduction-to-Git-and-GitHub:mainfrom

Cristian-Sal0217:bug-fix-typoCristian-Sal0217/mcino-Introduction-to-Git-and-GitHub:bug-fix-typoCopy head branch name to clipboard