Parse MILLENNIUM

[sarahyurick]

There is currently support for MILLENIUM, but not for MILLENNIUM (with 2 N's) such as from the Postgres docs. These changes allow for both to be parsed.

[coveralls]

Pull Request Test Coverage Report for Build 3146595623

• 2 of 3 (66.67%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.005%) to 85.576%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/parser.rs	1	2	50.0%

Totals
Change from base Build 3142982335:	-0.005%
Covered Lines:	10145
Relevant Lines:	11855

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💛 - Coveralls