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travis-ci

feat: support optional preload attributes

Support adding additional attributes to preload Link headers, to signal
to downstream servers if the resources should be converted to HTTP/2
Server Push.

The Preload specification defines "nopush" to signal that the downstream
server should not push the resources.[0] Fastly also supports
"x-http2-push-only"[1], other downstreams may implement other
attributes.

[0]: https://www.w3.org/TR/preload/#server-push-http-2
[1]: https://docs.fastly.com/guides/performance-tuning/http2-server-push

[terinjokes@gmail.com: added commit message]
Signed-off-by: terinjokes@gmail.com

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