Updated Drupal to 8.6. This goes with the following updates because it's possible...

[yaffs-website] / web / core / modules / views / tests / modules / views_test_modal / views_test_modal.info.yml

name: 'Views Test Modal'
type: module
description: 'Provides a test page that renders a View in a modal.'
package: Testing
version: VERSION
core: 8.x
dependencies:
  - drupal:node
  - drupal:views