Merge branch '113-add-ubuntu18-04-as-supported-os-for-clients' into 'master'

Resolve "add Ubuntu18.04 as supported OS for clients"

Closes #113

See merge request !114
4 jobs for 114-fix-release-process in 3 minutes and 57 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Syntax
passed #27739
syntax lint metadata_lint check:symlinks check:git_ignore check:dot_underscore check:test_file rubocop-Ruby 2.5.1-Puppet ~> 5.5

00:02:29

 
  Unit
passed #27740
parallel_spec-Ruby 2.5.1-Puppet ~> 5.5

00:01:27

 
  Acceptance Puppet5
canceled #27741
puppet-tests
acceptance with puppet5

 
  Acceptance Puppet6
canceled #27742
puppet-tests
acceptance with puppet6