chore: use semantic-release cross-formula standard structure

* Automated using `ssf-formula` (v0.1.0-rc.1)

.travis.yml

@@ -1,3 +1,6 @@
+# -*- coding: utf-8 -*-
+# vim: ft=yaml
+---
 stages:
   - test
   - commitlint
@@ -7,6 +10,7 @@ stages:
 sudo: required
 cache: bundler
 language: ruby
+dist: xenial
 
 services:
   - docker
@@ -31,19 +35,15 @@ env:
     - INSTANCE: default-ubuntu-1604-2018-3-py2
     # - INSTANCE: default-centos-7-2018-3-py2
     # - INSTANCE: default-fedora-29-2018-3-py2
-    # TODO: Use this when fixed instead of `opensuse-leap-42`
-    # Ref: https://github.com/netmanagers/salt-image-builder/issues/2
-    # - INSTANCE: default-opensuse-leap-15-2018-3-py2
     - INSTANCE: default-opensuse-leap-42-2018-3-py2
     # - INSTANCE: default-debian-8-2017-7-py2
     # - INSTANCE: default-ubuntu-1604-2017-7-py2
-    # TODO: Enable after improving the formula to work with other than `systemd`
     - INSTANCE: default-centos-6-2017-7-py2
     # - INSTANCE: default-fedora-28-2017-7-py2
     # - INSTANCE: default-opensuse-leap-42-2017-7-py2
 
 script:
-  - bundle exec kitchen verify ${INSTANCE}
+  - bin/kitchen verify ${INSTANCE}
 
 jobs:
   include: