Made changes to preface.asciidoc

preface.asciidoc

@@ -58,7 +58,7 @@ All the code snippets use real values and calculations where possible, so that y
 
 This book is here to help you get your job done. In general, if example code is offered with this book, you may use it in your programs and documentation. You do not need to contact us for permission unless you’re reproducing a significant portion of the code. For example, writing a program that uses several chunks of code from this book does not require permission. Selling or distributing a CD-ROM of examples from O’Reilly books does require permission. Answering a question by citing this book and quoting example code does not require permission. Incorporating a significant amount of example code from this book into your product’s documentation does require permission.
 
-We appreciate, but do not require, attribution. An attribution usually includes the title, author, publisher, and ISBN. For example: “_Mastering Bitcoin_ by Andreas M. Antonopoulos (O’Reilly). Copyright 2014 Andreas M. Antonopoulos, 978-1449374044.”
+We appreciate, but do not require, attribution. An attribution usually includes the title, author, publisher, and ISBN. For example: “_Mastering Bitcoin_ by Andreas M. Antonopoulos (O’Reilly). Copyright 2015 Andreas M. Antonopoulos, 978-1-449-37404-4.”
 
 Some editions of this books are offered under an open source license, such as CC-BY-NC (creativecommons.org) in which case the terms of that license apply.
 
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 * Jason Bisterfeldt: jbisterfeldt
 * Ed Leafe: EdLeafe
 
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 === Quick Glossary
 
 This quick glossary contains many of the terms used in relation to bitcoin. These terms are used throughout the book, so bookmark this for a quick reference and clarification.