sds / haml-lint / 16484478463

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Make sure todo file generates with a newline at the end (#584)

**What**

Make sure todo file generates with a newline at the end

**Why**

Everytime I regenerate a haml lint todo file I have to manually add in a newline so that we don't
lose it.

**Notes**

This matches how rubocop works as can be seen in the contents of
[spec/rubocop/formatter/disabled_config_formatter_spec.rb](https://github.com/rubocop/rubocop/blob/6c522f8db/spec/rubocop/formatter/disabled_config_formatter_spec.rb#L105-L121):

```
let(:expected_rubocop_todo) do
  [heading,
    '# Offense count: 2',
    'Test/Cop1:',
    '  Exclude:',
    "    - 'Gemfile'",
    "    - 'test_a.rb'",
    "    - 'test_b.rb'",
    '',
    '# Offense count: 1',
    'Test/Cop2:',
    '  Exclude:',
    "    - '**/*.blah'",
    '    - !ruby/regexp /.*/bar/*/foo\.rb$/',
    "    - 'test_a.rb'",
    ''].join("\n")
end
```

1 of 1 new or added line in 1 file covered. (100.0%)

2757 of 2835 relevant lines covered (97.25%)

21034.57 hits per line