Typo in Chapter 5: "Gituhb" should be "Github"

[jonathan-barrios]

There is a typo in the section about API infrastructure and user roles here.

The sentence currently reads:

In the case of Gituhb, we call them Github server-side methods, and we will store them in our server/github.js file.

Typo:
"Gituhb" should be"Github".