chore: Use HTTPS for icecast access (#881)

HTTP is not private and allows man-in-the-middle attacks. HTTPS provides some privacy and protects against simple man-in-the-middle attacks.

plugins/icecast/__init__.py

@@ -69,7 +69,7 @@ def __init__(self, exaile):
         """
         self.exaile = exaile
         self.user_agent = exaile.get_user_agent_string('icecast')
-        self.icecast_url = 'http://dir.xiph.org'
+        self.icecast_url = 'https://dir.xiph.org'
 
         self.xml_url = self.icecast_url + '/yp.xml'
         self.genres_url = self.icecast_url + '/genres'