Merge pull request leonardomso#18 from jukefr/patch-1

add MDN link for leonardomso#2

Author: leonardomso

README.md

@@ -99,6 +99,7 @@ This repository was created with the intention of helping developers master thei
  * 📜 [The Secret Life of JavaScript Primitives — Angus Croll](https://javascriptweblog.wordpress.com/2010/09/27/the-secret-life-of-javascript-primitives/)
  * 📜 [Primitive Types — Flow](https://flow.org/en/docs/types/primitives/)
  * 📜 [(Not) Everything in JavaScript is an Object - Daniel Li](http://blog.brew.com.hk/not-everything-in-javascript-is-an-object/)
+ * 📜 [JavaScript data types and data structures - MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Primitive_values)
 
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