Address build warnings on the 'operator' member variable of structs

[LowAmmo]

Just seeing a build warning when targetting a higher iOS version -

 private let `operator`: Operator = .lowerThan

Immutable property will not be decoded because it is declared with an initial value which cannot be overwritten

I can work on a PR to address...and would appreciate a follow up cocoapods release so we would be able to consume the updated code.

-Thanks!

[LowAmmo]

Nevermind...looks like this has already been addressed with v. 2.0.1.

We consume this through SwiftJWT, which is still referencing 1.2 in the current cocoapod version.

Will work on a PR to update the cocoapod version of SwiftJWT.

[LowAmmo]

Somewhat related - while I was working to resolve the warning (that isn't a problem anymore in the latest version), I saw a new warning in the test file.

Will go ahead and submit a PR to address that warning.

[LowAmmo]

 guard let myQueryData: Data = try? QueryEncoder().encode(query) else {

Immutable value 'myQueryData' was never used; consider replacing with '_' or removing it