* Add Python courses

* Fix to travis

* add quality article

lang & book choice, What to use when learning a programming language and how solve problems (very extensively and accurately)

* alphabetical

* Update free-programming-books.md

* Update free-programming-books.md

* Update free-programming-books.md

* Update free-programming-books.md

* add notations

* alphabet

* Added interactive OpenGL Shading Language Tutorial

* fix spacing

* trailing slash

* Update free-programming-books.md

* Update free-programming-books.md

* add notations

* Update free-programming-books.md

About author:
https://www.amazon.com/default/e/B001IXTSLU/ref=dp_byline_cont_book_1?redirectedFromKindleDbs=true
https://en.wikipedia.org/wiki/Mark_Burgess_(computer_scientist)

* Update free-programming-books.md

* Add javascript courses

* Add HTML courses

* Fix for travis

* Add Deep Learning for Self-Driving Cars course

* trailing slash

* RPi OS development tutorial added

* moved to free-programming-interactive-tutorials-en.md

* emty line added

* ASP.NET Core El Kitabı

ASP.NET Core El Kitabı

* fix spacing, heading

copied the heading from another list; the link didn't work.
The linter enforces spacing between sections

* one more space

*   Update problem-sets-competitive-programming.md

 Added LeetCode platform  in Competitive Programming section.

* Update problem-sets-competitive-programming.md

Added LeetCode platform in  Competitive Programming

Remove R interactive tutorial from the list as it redirects to Pluralsight instead of CodeSchool

* Update link to "Advanced Linux Programming"

* Mark book as PDF

* Fix authors names

* Update link to "Advanced Linux Programming"

* Mark book as PDF

* Add Italian C/C++ resources

* Update free-programming-books-it.md

Fix TravisCI error

* Update free-courses-en.md

Google's machine learning crash course added

* Update free-courses-en.md

Alphabetic order changed

* Remove broken links in Italian books

* Add Italian Perl resources

* Add year of pubblication of the Perl course

* Update free programming books it

* UPDATE free-programming-books in italian

* Added year of pubblication of the js course

* Update year of pubblication in italian

* Added author to js course

* Removed trailing slash from URL

* Update README

* Update Readme with CC BY licence

* DRY: link to LICENSE.md, not to CC. also spelling