fix MultilineArrayTrailingCommaFixer with heredoc
bug #594 fix MultilineArrayTrailingCommaFixer with heredoc (sstok)

This PR was merged into the 1.0.x-dev branch.

Discussion
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fix MultilineArrayTrailingCommaFixer with heredoc

|Q            |A   |
|---          |--- |
|Bug Fix?     |yes |
|New Feature? |n   |
|BC Breaks?   |n   |
|Deprecations?|n   |
|Tests Pass?  |yes |
|Fixed Tickets|#591|
|License      |MIT |

Commits
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a6218de fix MultilineArrayTrailingCommaFixer with heredoc