Fix broken self book link (EbookFoundation#2591)

panzarino · eshellman · commit a868ae124d7a · 2017-10-16T14:57:38.000-04:00
diff --git a/free-programming-books.md b/free-programming-books.md
@@ -2166,7 +2166,7 @@ For resources on Angular, Backbone, D3, Dojo, Ember, Express, jQuery, Knockout,
 
 ### Self
 
-* [The Self Handbook](http://handbook.selflanguage.org/current/)
+* [The Self Handbook](http://handbook.selflanguage.org)
 
 
 ### Smalltalk
