gddo-server: show bugs link in package index section.

This fixes #387.

Change-Id: If6115257aeb1fcad6b6ccf9e840b91df50550407
Reviewed-on: https://go-review.googlesource.com/20702
Reviewed-by: Andrew Gerrand <adg@golang.org>
diff --git a/gddo-server/assets/templates/pkg.html b/gddo-server/assets/templates/pkg.html
index 9bd8f68..50916a5 100644
--- a/gddo-server/assets/templates/pkg.html
+++ b/gddo-server/assets/templates/pkg.html
@@ -76,6 +76,7 @@
             {{range .Methods}}<li><a href="#{{$t.Name}}.{{.Name}}">{{.Decl.Text}}</a></li>{{end}}
             {{if or .Funcs .Methods}}</ul>{{end}}
           {{end}}
+          {{if .Notes.BUG}}<li><a href="#pkg-note-bug">Bugs</a></li>{{end}}
         </ul>
 
         <!-- Examples -->