README: update links and use https URLs

README

@@ -21,16 +21,16 @@ If you want to install to your home directory, you should instead do:
 
 You'll need to make sure that $HOME/.local/bin is in your PATH, of course.
 
-See http://www.freedesktop.org/wiki/Standards/shared-mime-info-spec for more
+See https://www.freedesktop.org/wiki/Specifications/shared-mime-info-spec/ for more
 information.
 
 
 Please report bugs here: https://gitlab.freedesktop.org/xdg/shared-mime-info/issues
 
-	http://www.freedesktop.org/wiki/GettingInvolved
+	https://www.freedesktop.org/wiki/GettingInvolved/
 
 Useful reference links:
 IANA:
-http://www.iana.org/assignments/media-types/
+https://www.iana.org/assignments/media-types/
 KDE's old mime-types:
 http://websvn.kde.org/branches/KDE/3.5/kdelibs/mimetypes/