Link to the official site for Data Munging with Perl (#3666)

* Link to the official site for Data Munging with Perl * satisfy linter
EbookFoundation · Aug 6, 2020 · 068f72e · 068f72e
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diff --git a/free-programming-books.md b/free-programming-books.md
@@ -2064,7 +2064,7 @@ Kerridge (PDF) (email address *requested*, not required)
 ### Perl
 
 * [Beginning Perl](https://www.perl.org/books/beginning-perl/)
-* [Data Munging with Perl](http://perlhacks.com/dmp.pdf) (PDF)
+* [Data Munging with Perl](https://datamungingwithperl.com) (PDF)
 * [Embedding Perl in HTML with Mason](http://masonbook.houseabsolute.com/book/) - D. Rolsky, K. Williams
 * [Essential Perl](http://cslibrary.stanford.edu/108/EssentialPerl.pdf) (PDF)
 * [Exploring Programming Language Architecture in Perl](http://www.billhails.net/Book/)