Removed Learned Enough to Be Dangerous books (#3337)

free-programming-books.md

@@ -1237,7 +1237,6 @@ Kerridge (PDF) (email address *requested*, not required)
 * [GitHub Cheat Sheet](https://github.com/tiimgreen/github-cheat-sheet) - Tim Green (Markdown)
 * [Intoduction to Git and Github](https://launchschool.com/books/git) - Launch School
 * [Intoduction to Git and Github - Tutorial](http://cse.unl.edu/~cbourke/gitTutorial.pdf) - Dr. Chris Bourke (PDF)
-* [Learn Enough Git to be Dangerous](https://www.learnenough.com/git-tutorial) - Michael Hartl
 * [Learn Git - Learn Version Control with Git](http://www.git-tower.com/learn/git/ebook/command-line/introduction) - Tobias Günther
 * [Pro Git](http://git-scm.com/book/en/v2) - Scott Chacon
 * [Pro Git Reedited](https://leanpub.com/progitreedited/read) - Jon Forrest
@@ -1727,7 +1726,6 @@ Kerridge (PDF) (email address *requested*, not required)
 * [GTK+/Gnome Application Development](http://www.linuxtopia.org/online_books/gui_toolkit_guides/gtk+_gnome_application_development/)
 * [Hardened Linux From Scratch](http://www.linuxfromscratch.org/hlfs/download.html)
 * [Kali Linux: Professional Penetration-Testing Distribution](http://docs.kali.org)
-* [Learn Enough Command Line to Be Dangerous](https://www.learnenough.com/command-line-tutorial) - Michael Hartl
 * [Learning Debian GNU/Linux](http://www.oreilly.com/openbook/debian/book/index.html)
 * [Linux 101 Hacks](http://thegeekstuff.s3.amazonaws.com/files/linux-101-hacks.zip) - Ramesh Natarajan (PDF)
 * [Linux Administrator's Security Guide](http://www.linuxtopia.org/online_books/linux_administrators_security_guide/index.html)