[openstreetmap-website] Make /api/.../history also return the changeset comment (#534)

[Simon Legner]

Instead, allow `/api/0.6/changesets?changesets=1,2,3`: 1d1f194d598e54a5d6fb4f38fb569d4138af0dc8.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/issues/534#issuecomment-29923924
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