v506

Merge pull request #3469 from alphagov/dependabot/bundler/mocha-2.7.0

v505

Merge pull request #3466 from alphagov/upgrade-express-2

Upgrade express to 4.21.2

v504

Merge pull request #3465 from alphagov/dependabot/bundler/rubocop-gov…

v502

Merge pull request #3463 from alphagov/dependabot/bundler/govuk_publi…

v501

Merge pull request #3462 from alphagov/dependabot/bundler/govuk_app_c…

v499

Merge pull request #3460 from alphagov/dependabot/npm_and_yarn/jasmin…

v498

Merge pull request #3458 from alphagov/dependabot/bundler/gds-api-ada…

v497

Merge pull request #3461 from alphagov/restore-lost-chat-banners

Restore GOV.UK Chat banner to nested guide page

v496

Merge pull request #3414 from alphagov/remove-important-metadata-comp…

v495

Merge pull request #3459 from alphagov/dependabot/bundler/govuk_publi…