Update README.md

Author: alesanchezr

README.md

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 # CSS Layouts Exercises
 
 By [@alesanchezr](https://twitter.com/alesanchezr) and [other contributors](https://github.com/4GeeksAcademy/css-layouts-tutorial-exercises/graphs/contributors) at [4Geeks Academy](http://4geeksacademy.co/)
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 [![build by developers](https://img.shields.io/twitter/follow/4geeksacademy?style=social&logo=twitter)](https://twitter.com/4geeksacademy)
 
 Hi! I'm [Alejandro Sanchez @alesanchezr](https://github.com/alesanchezr), really excited to have you here! 🎉 😂 Learning to code is hard, you need coaching! [DM me on twitter](https://twitter.com/alesanchezr) if you have any question. 
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 ## You'll be learning the following concepts:
 
 1. Display vs Position
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 6. Using `:before` and `:after`.
 
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 <h4>Before we start... other related tutorials</h4>
 <ol>
   <li><a href="https://github.com/4GeeksAcademy/html-tutorial-exercises-course">Learn HTML</a></li>
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 $ npm i jest@24.8.0 -g
 $ learnpack start
 ```
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 Note: The exercises have automatic grading but its very rigid and string, my recomendation is to ignore the tests and use them only as a recomendation or you can get frustrated.