addressing Mark's comments
Remove Ubuntu versions which aren't supported by upstream
Make job plural
Merge pull request #736 from hflynn/insight-contrib

Updating insight contributing file
merge dev_5_0 -D org: PR 737 (Remove Ubuntu versions which aren't supported by upstream)
merge dev_5_0 -D org

Repository: openmicroscopy/ome-documentation
Updating 9e66a7a..6d9a1cc
Merged PRs (fast-forward):
  # PR 736 hflynn 'Updating insight contributing file'

Merged PRs:
  # PR 737 manics 'Remove Ubuntu versions which aren't supported by upstream'

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