[openstreetmap/openstreetmap-website] Set the rubocop target ruby version to 2.3 (#2000)

[Andy Allan]

This allows rubocop to run additional cops that would not apply to older ruby versions.

Refs #1918 
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/2000

-- Commit Summary --

  * Set the rubocop target version to 2.3

-- File Changes --

    M .rubocop.yml (3)
    M .rubocop_todo.yml (67)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/2000.patch
https://github.com/openstreetmap/openstreetmap-website/pull/2000.diff

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