add ubuntu1804 as supported OS

[Dan33l]

Pull Request (PR) description

This Pull Request (PR) fixes the following issues

Fixes #1307

[dhoppe]

@Dan33l I think you need to add bionic to the array. Otherwise this module will stick to its defaults and does not manage the repository.

[Dan33l]

@dhoppe thank you for the comment.
I pushed the the updated array.

[LongLiveCHIEF]

I'm not sure about the package source failures. My usage of the module on 18.04 disables the package management since I provide my own source repos and management for that.

[dhoppe]

@LongLiveCHIEF At least the latest commit fixed the unit tests. The current error message is related to the acceptance tests and Passenger.

[Dan33l]

https://github.com/voxpupuli/puppet-nginx/blob/master/spec/acceptance/class_spec.rb#L55

The test checks the output of command dpkg -s nginx | grep ^Maintainer And with the current setup on ubuntu18.04 it gets Maintainer: Ubuntu Developers <ubuntu-devel-discuss@lists.ubuntu.com>

Is it normal or not ?

With following code i suppose it is not. But perhaps it is, if i compare with Debian 9.

          class { 'nginx':
            package_source => 'passenger'
          }