Fix clippy lints

[joshwd36]

Implements the changes suggested in clippy. Mostly to do with ranges.

[coveralls]

Pull Request Test Coverage Report for Build 457851358

• 32 of 38 (84.21%) changed or added relevant lines in 9 files are covered.
• 8 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+0.7%) to 92.076%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/dialect/generic.rs	5	8	62.5%
src/dialect/mssql.rs	5	8	62.5%

Files with Coverage Reduction	New Missed Lines	%
src/dialect/ansi.rs	1	85.71%
src/parser.rs	7	88.39%

Totals
Change from base Build 449512338:	0.7%
Covered Lines:	4857
Relevant Lines:	5275

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💛 - Coveralls

[Dandandan]

LGTM. thanks @joshwd36