Update ruby_parser
Update ruby_parser

Getting a bugfix for 2.3:
- https://github.com/seattlerb/ruby_parser/commit/b279ea87563b56e31a90b155f5e02725b8d8ade9
- https://github.com/seattlerb/ruby_parser/commit/116c8f8538acb04a69b1f937058a63e1f96c99b7

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