Flexible way to set HTTP response headers. See issue #48#49
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Provide a `with_header()` method on `Builder` allowing a HTTP header to be included in the HTTP response when the exporter is scraped. The method can be called multiple times to add any number of headers. By placing this on `Builder` we parse the header string into a `tiny_http` `Header` object just once, and ensure the header is valid before starting the exporter.
Prometheus scrapers want a specific `Content-Type` header, so set that by default.
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