added feedback section

learnbyexample · Nov 4, 2019 · c21ad7f · c21ad7f
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@@ -24,6 +24,18 @@ For a preview of the book, see [sample chapters](https://github.com/learnbyexamp
 
 <br>
 
+# Feedback
+
+Please open an issue if you spot any typo/errors.
+
+I'd also highly appreciate your feedback about the book.
+
+Goodreads: https://www.goodreads.com/book/show/48641172-gnu-sed
+
+Twitter: https://twitter.com/learn_byexample
+
+<br>
+
 # Table of Contents
 
 1) Preface