restore the file name of each book

README.md

@@ -9,23 +9,23 @@ Moved to GitHub for collaborative updating and for the purpose of reSRC.io : [Li
 #### [French : Free programming books](http://resrc.io/list/33/livres-gratuits-sur-la-programmation/) -- free-programming-books-fr.md
 The French list was based on <http://progdupeu.pl/forums/sujet/43/une-banque-de-liens>.
 
-#### [German : Free programming books](/free-programming-books-de.md)
+#### [German : Free programming books](/free-programming-books-de.md) -- free-programming-books-de.md
 
-#### [Italian : Free programming books](/free-programming-books-it.md)
+#### [Italian : Free programming books](/free-programming-books-it.md) -- free-programming-books-it.md
 
-#### [Japanese : Free programming books](/free-programming-books-ja.md)
+#### [Japanese : Free programming books](/free-programming-books-ja.md) -- free-programming-books-ja.md
 
-#### [Russian : Free programming books](/free-programming-books-ru.md)
+#### [Russian : Free programming books](/free-programming-books-ru.md) -- free-programming-books-ru.md
 
-#### [Chinese : Free programming books](/free-programming-books-ch.md)
+#### [Chinese : Free programming books](/free-programming-books-ch.md) -- free-programming-books-ch.md
 
-#### [Portuguese : Free programming books](/free-programming-books-pt_BR.md)
+#### [Portuguese : Free programming books](/free-programming-books-pt_BR.md) -- free-programming-books-pt_BR.md
 
-#### [Persian : Free programming books](/free-programming-books-fa.md)
+#### [Persian : Free programming books](/free-programming-books-fa.md) -- free-programming-books-fa.md
 
-#### [Spanish : Free programming books](/free-programming-books-es.md)
+#### [Spanish : Free programming books](/free-programming-books-es.md) -- free-programming-books-es.md
 
-#### [Korean : Free programming books](/free-programming-books-ko.md)
+#### [Korean : Free programming books](/free-programming-books-ko.md) -- free-programming-books-ko.md
 
 ### [Free JavaScript frameworks resources and tutorials](http://resrc.io/list/18/javascript-frameworks/) -- javascript-frameworks-resources.md