Update free-courses-pl.md (#2906)

* Add Python courses

* Fix to travis

free-courses-pl.md

@@ -10,6 +10,7 @@
 * [JavaScript](#javascript)
 * [MySQL](#mysql)
 * [PHP](#php)
+* [Python](#python)
 
 
 ### Assembly Language
@@ -68,3 +69,11 @@
 ### PHP
 
 * [Kurs PHP. Programowanie backendowe](https://www.youtube.com/playlist?list=PLOYHgt8dIdox81dbm1JWXQbm2geG1V2uh) - Mirosław Zelent, Damian Stelmach
+
+
+### Python
+
+* [Kurs Python](https://www.youtube.com/playlist?list=PL3yDCQ6GKeEyBOF0gZyBvihDv6n0GNsdm)
+* [Kurs Python - Darmowy Po Polsku](https://www.youtube.com/playlist?list=PL_dDQ_G9rdI6dQsDkwqSQyAeXY3uUrWzp)
+* [Kurs Python 3](https://www.youtube.com/playlist?list=PLdBHMlEKo8UcOaykMssI1_X6ui0tzTNoH)
+* [Python 3 - Kurs wideo](https://www.youtube.com/playlist?list=PLbOPmSDkHx2pCboufcEKkinpUuramshmr)