Update metadata for 11.8.0

Author: kitchen-porter

metadata.rb

@@ -3,7 +3,7 @@
 maintainer_email  'help@sous-chefs.org'
 license           'Apache-2.0'
 description       'Provides docker_service, docker_image, and docker_container resources'
-version           '11.7.0'
+version           '11.8.0'
 source_url        'https://github.com/sous-chefs/docker'
 issues_url        'https://github.com/sous-chefs/docker/issues'
 chef_version      '>= 16.0', '< 19.0'