Update book to newest version.

Add newest version of Unix and Linux System Administration Handbook
ArturN · Dec 13, 2017 · 1cd0961 · 1cd0961
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@@ -1497,7 +1497,7 @@ You're never really done.
 - [ ] [Design Patterns: Elements of Reusable Object-Oriented Software](https://www.amazon.com/Design-Patterns-Elements-Reusable-Object-Oriented/dp/0201633612)
     - aka the "Gang Of Four" book, or GOF
     - the canonical design patterns book
-- [ ] [UNIX and Linux System Administration Handbook, 4th Edition](https://www.amazon.com/UNIX-Linux-System-Administration-Handbook/dp/0131480057/)
+- [ ] [UNIX and Linux System Administration Handbook, 5th Edition](https://www.amazon.com/UNIX-Linux-System-Administration-Handbook/dp/0134277554/)
 
 ## Additional Learning