Allow a trailing comment as a description comment for Bundler/GemComment

[pocke]

Bundler/GemComment cop isn't aware of trailing comments.

# Gemfile


# It is allowed

# It's a cool gem
gem 'rubocop'


# But it is not allowed

gem 'rubocop' # It's a cool gem

This pull request fixes this problem.

The cop will allow both of the gem 'rubocop' with this patch.

Cause

In gem 'rubocop' # It's a cool gem, the comment isn't associated with the send node. Actually it is associated with the str node, which is 'rubocop'.
So we need to check comments for descendants.

---

Before submitting the PR make sure the following are checked:

• Wrote good commit messages.
• Commit message starts with [Fix #issue-number] (if the related issue exists).
• Feature branch is up-to-date with master (if not - rebase it).
• Squashed related commits together.
• Added tests.
• Added an entry to the Changelog if the new code introduces user-observable changes. See changelog entry format.
• The PR relates to only one subject with a clear title and description in grammatically correct, complete sentences.
• Run bundle exec rake default. It executes all tests and RuboCop for itself, and generates the documentation.

[koic]

Good catch 👍