update link Using Blocks in Ruby (#4347)

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Faizar Septiawan 4 years ago committed by GitHub
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      free-programming-books.md

@ -2489,7 +2489,7 @@ Kerridge (PDF) (email address *requested*, not required)
* [The Definitive Ruby Tutorial For Complete Beginners](https://www.rubyguides.com/ruby-tutorial/) - Jesus Castello * [The Definitive Ruby Tutorial For Complete Beginners](https://www.rubyguides.com/ruby-tutorial/) - Jesus Castello
* [The Ruby Reference](https://rubyreferences.github.io/rubyref/) - Victor Shepelev * [The Ruby Reference](https://rubyreferences.github.io/rubyref/) - Victor Shepelev
* [The Unofficial Ruby Usage Guide (at Google)](http://www.caliban.org/ruby/rubyguide.shtml) - Ian Macdonald * [The Unofficial Ruby Usage Guide (at Google)](http://www.caliban.org/ruby/rubyguide.shtml) - Ian Macdonald
* [Using Blocks in Ruby](https://www.oreilly.com/programming/free/using-blocks-in-ruby.csp) - Jay McGavren (email address *requested*) * [Using Blocks in Ruby](https://www.oreilly.com/programming/free/files/using-blocks-in-ruby.pdf) - Jay McGavren (PDF)
* [Why's (Poignant) Guide to Ruby](http://poignant.guide) * [Why's (Poignant) Guide to Ruby](http://poignant.guide)

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