[openstreetmap-website] adding srcset for osm logo img (#1058)

[Holger Jeromin]

This way we can support Safari and Internet Explorer, which does not support `picture` element, but `srcset` on the `img` tag.

related to #850 
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/1058

-- Commit Summary --

  * adding srcset for osm logo

-- File Changes --

    M app/views/layouts/_header.html.erb (2)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/1058.patch
https://github.com/openstreetmap/openstreetmap-website/pull/1058.diff

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/1058
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