Update free-courses-en.md (#4676)

* Update free-courses-en.md

* Update free-courses-en.md
Co-authored-by: NSeth <seth@elypia.org>
Co-authored-by: NSeth <seth@elypia.org>

free-courses-en.md

@@ -498,6 +498,7 @@
 * [Learn to Program: The Fundamentals](https://www.coursera.org/learn/learn-to-program) (Coursera)
 * [Learn to Program Using Python](https://www.edx.org/course/learn-program-using-python-utarlingtonx-cse1309x) (edX)
 * [Programming Foundations with Python](https://www.udacity.com/course/programming-foundations-with-python--ud036) (Udacity)
+* [Python 3](https://www.sololearn.com/Course/Python/) (SoloLearn)
 * [Python Beginners-Intermediate Tutorial](https://www.youtube.com/playlist?list=PL-osiE80TeTt2d9bfVyTiXJA-UTHn6WwU) - Corey Schafer
 * [Python Built in Functions A to Z Tutorial and Examples](https://www.youtube.com/playlist?list=PLrJGwAG1U62RW_hGGnk7xXG0LciHkT54X) - Brainy Things
 * [Python Course](http://www.python-course.eu)
@@ -611,4 +612,3 @@
 * [Python Web Scraping & Crawling using Scrapy](https://www.youtube.com/playlist?list=PLhTjy8cBISEqkN-5Ku_kXG4QW33sxQo0t)
 * [The Odin Project - Learn Web Development for Free](http://www.theodinproject.com)
 * [Web Information Retrieval](https://www.youtube.com/playlist?list=PLAQopGWlIcya-9yzQ8c8UtPOuCv0mFZkr) - L. Becchetti, A. Vitaletti (University of Sapienza Rome)
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