Update ML books (#3902)

free-programming-books.md

@@ -481,6 +481,7 @@
 * [Learning Deep Architectures for AI](https://mila.quebec/wp-content/uploads/2019/08/TR1312.pdf) (PDF)
 * [Machine Learning](http://www.intechopen.com/books/machine_learning)
 * [Machine Learning for Data Streams](https://moa.cms.waikato.ac.nz/book-html/) - Albert Bifet, Ricard Gavaldà, Geoff Holmes, Bernhard Pfahringer
+* [Machine Learning from Scratch](https://dafriedman97.github.io/mlbook/content/introduction.html) - Danny Friedman
 * [Machine Learning, Neural and Statistical Classification](http://www1.maths.leeds.ac.uk/~charles/statlog/)
 * [Mathematics for Machine Learning](https://gwthomas.github.io/docs/math4ml.pdf) - Garrett Thomas (PDF)
 * [Neural Networks and Deep Learning](http://neuralnetworksanddeeplearning.com)