Merge branch 'pr/1932'

Author: vhf

free-programming-books.md

@@ -853,6 +853,7 @@
 * [Software optimization resources by Agner Fog](http://www.agner.org/optimize/)
 * [The Boost C++ libraries](http://theboostcpplibraries.com)
 * [The Rook's Guide to C++](http://rooksguide.org/2013/11/26/version-1-0-is-out/) (PDF)
+* [The Ultimate Question of Programming, Refactoring, and Everything](https://www.gitbook.com/book/alexastva/the-ultimate-question-of-programming-refactoring-/details)
 * [Thinking in C++, Second Edition, Vol. 1.](http://www.mindviewinc.com/downloads/TICPP-2nd-ed-Vol-one.zip) - Bruce Eckel [(Vol. 2)](http://www.mindviewinc.com/downloads/TICPP-2nd-ed-Vol-two.zip) (ZIP)