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JIRA Ticket: n/a
What does this Pull Request do?
Updates the travis setup to test both Drupal 8.9.11 and 9.1.1 requires Islandora/islandora_ci#6
What's new?
Defines new environment variable DRUPAL_VERSION in the build matrix.
How should this be tested?
Once Islandora/islandora_ci#6 is merged, I'll make this live and it should both pass and test both Drupal 8 and 9.
Interested parties
@Islandora/8-x-committers