Remove extra newline in free-courses-en.md

Author: gellikeerthi

courses/free-courses-en.md

@@ -1657,7 +1657,7 @@
 * [Python: Visually Explained](https://www.youtube.com/playlist?list=PL8HmoRTjTSlHFhqRC_2iavGUOVnUdfAyl) - Visually Explained
 * [The Python Tutorial](https://docs.python.org/3/tutorial/)
 * [Using Python for Research](https://www.edx.org/course/using-python-for-research) (edX Harvard)
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 #### Django
 
 * [Complete Django Tutorial](https://www.youtube.com/playlist?list=PL4cUxeGkcC9iqfAag3a_BKEX1N43uJutw) - Net Ninja