Update README.md

Author: Mia von Steinkirch

README.md

@@ -1,14 +1,14 @@
-## Python & Algorithms Book 
+## Book on Python, Algorithms, and Data Structures
 
 
-➡️ [PDF (1st edition, 2014, published by Hanbit Media)](https://github.com/bt3gl/Python-and-Algorithms-and-Data-Structures/blob/master/First_edition_2014/ebook_pdf/book_second_edition.pdf) and [source code](https://github.com/bt3gl/Python-and-Algorithms-and-Data-Structures/blob/master/First_edition_2014).
+➡️ [PDF (1st edition, 2013, published by Hanbit Media in 2015)](https://github.com/bt3gl/Python-and-Algorithms-and-Data-Structures/blob/master/First_edition_2014/ebook_pdf/book_second_edition.pdf) and [source code](https://github.com/bt3gl/Python-and-Algorithms-and-Data-Structures/blob/master/First_edition_2014).
 
 
-➡️ [Source code (2nd edition, 2019)](https://github.com/bt3gl/Python-and-Algorithms-and-Data-Structures/blob/master/Second_edition_2019).
+➡️ [Source code (2nd edition, 2019, ported to Python 3.7)](https://github.com/bt3gl/Python-and-Algorithms-and-Data-Structures/blob/master/Second_edition_2019).
 
 
 
 ## License
 
 This work is licensed under a [Creative Commons Attribution-ShareAlike 4.0 International License](http://creativecommons.org/licenses/by-sa/4.0/).
-When making a reference to my work, please use my [website](http://bt3gl.github.io/index.html).
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