[openstreetmap-website] README: Add imagemagick to Ubuntu command for dependencies (#1119)

[Victor]

You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/1119

-- Commit Summary --

  * README: Add imagemagick to Ubuntu command for dependencies

-- File Changes --

    M INSTALL.md (2)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/1119.patch
https://github.com/openstreetmap/openstreetmap-website/pull/1119.diff

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/1119
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