Fix the broken links

Author: Ilya Nikolaevskiy

_posts/2011-07-06-webrtc-team-ietf-81-meeting-in-quebec-canada.md

@@ -10,5 +10,5 @@ Members of the team (@juberti, @alvestrand, @jtlinden) will be attending
 [IETF 81 in Québec, Canada, July 24th to July 30th][1]. We will also be
 attending the [W3C F2F][2] on Saturday, July 23rd.
 
-[1]: http://www.ietf.org/meeting/81/
+[1]: https://www.ietf.org/proceedings/81/index.html
 [2]: http://www.w3.org/2011/04/webrtc/Overview.html#meeting

_posts/2011-11-08-heads-down.md

@@ -24,7 +24,7 @@ fronts:
 Hopefully our next post will be soon, and will include a more useful URL :)
 
 
-[1]: http://www.ietf.org/meeting/82/index.html
+[1]: https://www.ietf.org/proceedings/82/index.html
 [2]: http://www.ietf.org/mail-archive/web/rtcweb/current/maillist.html
 [3]: http://lists.w3.org/Archives/Public/public-webrtc/
 [4]: http://www.w3.org/TR/webrtc/