pushing helloworld md for coursera
Merge branch 'master' of https://github.com/RobMagus/datasciencecoursera

I am trying to understand how git works. The current situation is this:

repo 'coursera-data-science' was created.
directory /repo on computer initialized.
origin set to url enting in /coursera-data-science.

(later:) repo renamed to datasciencecoursera, on github website.
HelloWorld.md created in /repo on computer.
attempted to push, failed due to origin being set.
pointed origin to new url ending in /datasciencecoursera (using git remote set-url)
git add and git commit worked fine, git push origin master asks for this msg.