Update README.md

Author: felipeshiwu

README.md

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 # Video recommender
 
-## Preview:
+## What is it:
 This project was built from the project oriented by the Data Science course [Como criar uma solução completa de Data Science | Mario Filho](http://mariofilho.com/curso/).
 
 The objective of this project is to build a Youtube video recommender, following a certain criterion which will be used to list a series of videos that, according to a machine learning score, we consider recommended.