[openstreetmap/openstreetmap-website] Updated References in INSTALL.md: Ubuntu 18.04 to 20.04 and Ruby 2.5 to 2.7 (#2922)

[nlaratta]

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

  https://github.com/openstreetmap/openstreetmap-website/pull/2922

-- Commit Summary --

  * Changed Ubuntu 18.04 to 20.04 and Ruby 2.5 to 2.7
  * Merge pull request #1 from nlaratta/install_doc

-- File Changes --

    M INSTALL.md (12)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/2922.patch
https://github.com/openstreetmap/openstreetmap-website/pull/2922.diff

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