futurecoder in lowercase (#6736)

Author: alexmojaki

Diff for: more/free-programming-interactive-tutorials-en.md

@@ -312,7 +312,7 @@
 
 * [Codecademy Python course](https://www.codecademy.com/learn/python)
 * [Data Analysis with Python Certification](https://www.freecodecamp.org/learn/data-analysis-with-python/) - freeCodeCamp
-* [Futurecoder](https://futurecoder.io) - Alex Hall
+* [futurecoder](https://futurecoder.io) - Alex Hall
 * [How to Think Like a Computer Scientist: Learning with Python, Interactive Edition](http://interactivepython.org/courselib/static/thinkcspy/index.html)
 * [Learn Python](http://www.learnpython.org)
 * [Learn Python Step by Step](http://www.techbeamers.com/python-tutorial-step-by-step)