- provisioner: docker
- images: ['litmusimage/debian:9', 'litmusimage/debian:10']
-travis_ub:
- provisioner: docker
- images: ['litmusimage/ubuntu:16.04', 'litmusimage/ubuntu:18.04']
-travis_el6:
- provisioner: docker
- images: []
+ provisioner: docker
+ images:
+ - litmusimage/debian:9
+ - litmusimage/debian:10
+travis_ub_6:
+ provisioner: docker
+ images:
+ - litmusimage/ubuntu:16.04
+ - litmusimage/ubuntu:18.04
+ - litmusimage/ubuntu:20.04