blog: redirect from HTTP to HTTPS on App Engine

Change-Id: I2ef91551ba253e4972a8656a1589239beea78c29
Reviewed-on: https://go-review.googlesource.com/22364
Reviewed-by: Francesc Campoy Flores <campoy@golang.org>
diff --git a/app.yaml b/app.yaml
index 882f5c9..0377f30 100644
--- a/app.yaml
+++ b/app.yaml
@@ -7,7 +7,9 @@
 - url: /favicon.ico
   static_files: static/favicon.ico
   upload: static/favicon.ico
+  secure: always
 - url: /.*
   script: _go_app
+  secure: always
 
 nobuild_files: ^(support|content)/