http2/h2demo: use Let's Encrypt for the TLS cert

The Google-issue one expired and it's too onerous to request another
and do it by hand.

Change-Id: I221406bc66de4b027b979fd87f6ec38f66318f9e
Reviewed-on: https://go-review.googlesource.com/33230
Reviewed-by: Tom Bergan <[email protected]>
Reviewed-by: Brad Fitzpatrick <[email protected]>
1 file changed
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