Change issue link to https. (dart-lang/http_multi_server#27)
Links in `CHANGELOG.md` should be secure.
diff --git a/pkgs/http_multi_server/CHANGELOG.md b/pkgs/http_multi_server/CHANGELOG.md
index 7bf1bfb..49d648b 100644
--- a/pkgs/http_multi_server/CHANGELOG.md
+++ b/pkgs/http_multi_server/CHANGELOG.md
@@ -87,4 +87,4 @@
particular, this works around [issue 19815][] on some Windows machines where
IPv6 failure isn't discovered until we try to connect to the socket.
-[issue 19815]: http://code.google.com/p/dart/issues/detail?id=19815
+[issue 19815]: https://code.google.com/p/dart/issues/detail?id=19815
