updates for version 1.5

Author: learnbyexample

README.md

@@ -18,10 +18,11 @@ You can purchase the book using these links:
 
 * https://gumroad.com/l/gnugrep_ripgrep
 * https://leanpub.com/gnugrep_ripgrep
+* You can also get the book as part of **Magical one-liners** bundle from https://gumroad.com/l/oneliners or https://leanpub.com/b/oneliners
 * You can also get the book as part of **Awesome Regex** bundle from https://leanpub.com/b/regex or https://gumroad.com/l/regex
 * See https://learnbyexample.github.io/books/ for list of other books
 
-For a preview of the book, see [sample chapters](https://github.com/learnbyexample/learn_gnugrep_ripgrep/blob/master/sample_chapters/grep_sample_v1p2.pdf)
+For a preview of the book, see [sample chapters](https://github.com/learnbyexample/learn_gnugrep_ripgrep/blob/master/sample_chapters/grep_sample_chapters.pdf)
 
 The book can also be [viewed as a single markdown file in this repo](./gnu_grep.md). See my blogpost on [generating pdf from markdown using pandoc](https://learnbyexample.github.io/tutorial/ebook-generation/customizing-pandoc/) if you are interested in the ebook creation process.
 
@@ -57,18 +58,16 @@ Twitter: https://twitter.com/learn_byexample
 
 # Acknowledgements
 
-* [GNU grep documentation](https://www.gnu.org/software/grep/manual/grep.html) - manual and examples
-* [ripgrep](https://github.com/BurntSushi/ripgrep) - user guide and examples
-* [stackoverflow](https://stackoverflow.com/) and [unix.stackexchange](https://unix.stackexchange.com/) - for getting answers to pertinent questions on `bash`, `grep` and other commands
-* [tex.stackexchange](https://tex.stackexchange.com/) - for help on `pandoc` and `tex` related questions
+* [GNU grep documentation](https://www.gnu.org/software/grep/manual/grep.html) — manual and examples
+* [ripgrep](https://github.com/BurntSushi/ripgrep) — user guide and examples
+* [stackoverflow](https://stackoverflow.com/) and [unix.stackexchange](https://unix.stackexchange.com/) — for getting answers to pertinent questions on `bash`, `grep` and other commands
+* [tex.stackexchange](https://tex.stackexchange.com/) — for help on `pandoc` and `tex` related questions
 * Cover image
-    * [draw.io](https://about.draw.io/)
+    * [LibreOffice Draw](https://www.libreoffice.org/discover/draw/)
     * [detective](https://www.flickr.com/photos/32068925@N08/3028314931) by [olarte.ollie](https://www.flickr.com/photos/ollieolarte/) under [Creative Commons Attribution-Share Alike 2.0 Generic](https://creativecommons.org/licenses/by-sa/2.0/)
-    * [train icon](https://www.iconfinder.com/icons/4213874/metro_train_transport_transportation_travelling_vehicle_icon) by [Yasir Masood](https://www.iconfinder.com/Muhammad_Auns) under [Creative Commons Attribution 3.0 Unported](https://creativecommons.org/licenses/by/3.0/)
-    * [plane icon](https://www.iconfinder.com/icons/3671993/airplane_filled_fly_plane_sky_travel_icon) by [Pondok Multimedia](https://www.iconfinder.com/Ontimedia)
 * [softwareengineering.stackexchange](https://softwareengineering.stackexchange.com/questions/39/whats-your-favourite-quote-about-programming) and [skolakoda](https://skolakoda.org/programming-quotes) for programming quotes
 * [Warning](https://commons.wikimedia.org/wiki/File:Warning_icon.svg) and [Info](https://commons.wikimedia.org/wiki/File:Info_icon_002.svg) icons by [Amada44](https://commons.wikimedia.org/wiki/User:Amada44) under public domain
-* [Andrew Gallant](https://blog.burntsushi.net/about/) (author of `ripgrep`) and [mikeblas](https://old.reddit.com/user/mikeblas) for critical feedback
+* [Andrew Gallant](https://blog.burntsushi.net/about/) (author of `ripgrep`) and [mikeblas](https://www.reddit.com/user/mikeblas) for critical feedback
 
 Special thanks to all my friends and online acquaintances for their help, support and encouragement, especially during difficult times.