Commit e436a94

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Add locking clause syntax to dialect (vapor#230)

Provide the correct PostgreSQL syntax for SELECT locking clauses via the new SQLDialect properties.

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Original file line number	Diff line number	Diff line change
`@@ -59,4 +59,12 @@ public struct PostgresDialect: SQLDialect {`
`59`	`59`	`public var unionFeatures: SQLUnionFeatures {`
`60`	`60`	`[.union, .unionAll, .intersect, .intersectAll, .except, .exceptAll, .explicitDistinct, .parenthesizedSubqueries]`
`61`	`61`	`}`
	`62`	`+`
	`63`	`+ public var sharedSelectLockExpression: SQLExpression? {`
	`64`	`+ SQLRaw("FOR SHARE")`
	`65`	`+ }`
	`66`	`+`
	`67`	`+ public var exclusiveSelectLockExpression: SQLExpression? {`
	`68`	`+ SQLRaw("FOR UPDATE")`
	`69`	`+ }`
`62`	`70`	`}`

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