[openstreetmap/openstreetmap-website] Add In-Reply-To, References headers to email (#2462)

[mmd]

@mmd-osm pushed 1 commit.

ac9614935cd1e3f54730632cf5b3cc6065de6add  Rubocop


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View it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/2462/files/0e4e24cb1e121c1779461c076a7cb0d5518e1ec3..ac9614935cd1e3f54730632cf5b3cc6065de6add
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