Currently there no support for Drush 9 and above.
bceyssens created an issue. See original summary.
Patch attached adds the Drush command service.
Issue #3225462 by bceyssens: Support for Drush 9 and above
Thanks for this, patch rolled into release candidate
Comments
Comment #2
bceyssensComment #3
bceyssensPatch attached adds the Drush command service.
Comment #5
andy_w commentedThanks for this, patch rolled into release candidate
Comment #6
andy_w commented