Fix cannot parse LEFT JOIN correctly

[git-hulk]

This closes #40

[coveralls]

Pull Request Test Coverage Report for Build 7781798018

• -9 of 34 (73.53%) changed or added relevant lines in 3 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage increased (+0.3%) to 59.198%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
parser/parser_query.go	20	29	68.97%

Files with Coverage Reduction	New Missed Lines	%
parser/parser_query.go	1	60.6%

Totals
Change from base Build 7780693192:	0.3%
Covered Lines:	4367
Relevant Lines:	7377

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💛 - Coveralls