[x/blog] template: update header to be consistent with golang.org

Also update the x/website module dependency to
v0.0.0-20200611220721-d72cde69aaaf

Change-Id: I4b361af3bfda31551b399b1158eec72e98367b1c
Reviewed-on: https://go-review.googlesource.com/c/blog/+/237599
Run-TryBot: Andrew Bonventre <[email protected]>
Reviewed-by: Julie Qiu <[email protected]>
TryBot-Result: Gobot Gobot <[email protected]>
X-Blog-Commit: 41e7c9cff4207ae36f08c22e02a425ab084697e0

Author: andybons

blog/go.mod

@@ -4,9 +4,9 @@ go 1.11
 
 require (
 	github.com/gorilla/context v1.1.1
-	golang.org/x/net v0.0.0-20200226121028-0de0cce0169b
+	golang.org/x/net v0.0.0-20200301022130-244492dfa37a
 	golang.org/x/text v0.3.2
 	golang.org/x/tools v0.0.0-20200331192549-ac2e956812a8
-	golang.org/x/website v0.0.0-20190903192346-00e97558e113
+	golang.org/x/website v0.0.0-20200611220721-d72cde69aaaf
 	gopkg.in/tomb.v2 v2.0.0-20161208151619-d5d1b5820637
 )