link and information for Ruby one-liners cookbook

Author: learnbyexample

ruby_one_liners.md

@@ -50,6 +50,12 @@
     * [Executing external commands](#executing-external-commands)
 * [Further Reading](#further-reading)
 
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+:information_source: :information_source: This chapter has been converted into a better formatted ebook - https://learnbyexample.github.io/learn_ruby_oneliners/. The ebook also has content updated for newer version of `ruby`, extra chapter for parsing json/csv/xml, includes exercises, solutions, etc.
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+---
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 <br>
 
 ```