Update installation_package_spec.rb
Update installation_package_spec.rb

Style/TrailingCommaInArrayLiteral: Put a comma after the last item of a multiline array.
Signed-off-by: S.Cavallo <27dc76dfa3f268619fd26cd4b996cdbc2dbdd83d@hotmail.com>
chef-cookbooks/docker,chef-cookbooks/docker,chef-cookbooks/docker