updated readme

Author: Fred Baptiste

README.md

@@ -1,9 +1,11 @@
 Python Deep Dive
 ================
 
-Various Jupyter notebooks and Python sources associated with my Python 3 Deep Dive course series:
-- https://www.udemy.com/python-3-deep-dive-part-1/
-- https://www.udemy.com/python-3-deep-dive-part-2/
-- https://www.udemy.com/python-3-deep-dive-part-3/
+Various Jupyter notebooks and Python sources associated with my Udemy Python 3 Deep Dive course series:
+
+- [Part 1](https://www.udemy.com/python-3-deep-dive-part-1/): Mainly functional programming
+- [Part 2](https://www.udemy.com/python-3-deep-dive-part-2/): Mainly iterables, iterators and generators
+- [Part 3](https://www.udemy.com/python-3-deep-dive-part-3/): Main hash maps
+- [Part 4](https://www.udemy.com/python-3-deep-dive-part-4/): OOP
 
 Many of these require Python 3.6 or above.