Added a few swedish developer podcasts (EbookFoundation#2627)

* Added a few swedish developer podcasts

* Changed link protocol to https where applicable and added trailing new

* Added a link in the README to the Swedish podcasts file

Author: papichulo

README.md

@@ -74,6 +74,7 @@ Free Podcasts and Screencasts:
 + [English](/free-podcasts-screencasts-en.md)
 + [Portuguese (Brazil)](/free-podcasts-screencasts-pt_BR.md)
 + [Russian](/free-podcasts-screencasts-ru.md)
++ [Swedish](/free-podcasts-screencasts-se.md)
 
 
 ### Programming Playgrounds

free-podcasts-screencasts-se.md

@@ -6,3 +6,6 @@
 ### Language Agnostic
 
 * [Podcast] - [Kodsnack](http://kodsnack.se)
+* [Podcast] - [Still in beta](http://stillinbeta.se)
+* [Podcast] - [Under utveckling](https://underutveckling.libsyn.com)
+* [Podcast] - [Väg 74](https://www.agical.se/pod)