Fix heredoc handling. Add support for interpolated heredocs.

[seanmil]

This should resolve #14 and possibly fix other heredoc-related bugs.

[genebean]

This seems to resolve the errors I was seeing related to #14 after #12. Now when I run bundle exec puppet-lint site dist site.pp --fix --only-checks trailing_comma and follow it up with bundle exec rake syntax I don't get errors related to heredoc's. For reference, I tested this by setting the following in my Gemfile:

gem 'puppet-lint-trailing_comma-check', git: 'https://github.com/seanmil/puppet-lint-trailing_comma-check.git', branch: 'fix_interpolated_heredocs'

[ekohl]

Thanks @seanmil for the patch and @genebean for testing!

[ekohl]

https://github.com/voxpupuli/puppet-lint-trailing_comma-check/releases/tag/0.4.1