FIX: Add 'case' to list of Swift keywords for Swift type generation

[Sid-MB]

What kind of change does this PR introduce?

Adds "case" to the list of Swift keywords so that a Postgres table with a column named 'case' won't cause the Swift type generation to produce invalid code.

What is the current behavior?

gen types swift with a table that has a column named 'case' will produce the following code:

public let case: String // ERROR: Keyword 'case' cannot be used as an identifier here. // FIX: If this name is unavoidable, use backticks to escape it

What is the new behavior?

case will be encoded in backticks so there will be no error:

public let `case`: String

Additional context

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[coveralls]

Pull Request Test Coverage Report for Build 16232138796

Details

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 76.117%

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Totals
Change from base Build 16045733927:	0.0%
Covered Lines:	5179
Relevant Lines:	6720

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💛 - Coveralls