Update free-programing-books-es.md

I just added linux to the index. Apparently someone forgot to add it.

Update free-programing-books-es.md
I just added linux to the index. Apparently someone forgot to add it.
fb9763b4 · José Cardona Figueroa · 99b54bc1 · fb9763b4
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free-programming-books-es.md free-programming-books-es.md +1 -0

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--- a/free-programming-books-es.md
+++ b/free-programming-books-es.md
@@ -25,6 +25,7 @@
    * [node.js](#nodejs)
 * [Java](#java)
 * [LaTeX](#latex)
+* [Linux](#linux)
 * [.NET (C# Visual Studio)](#net-c--visual-studio)
 * [NoSQL](#nosql)
    * [MongoDB](#mongodb)