prohibited_super_call rule false violation with NSFileProviderExtension providePlaceholder override

[BenStaveleyTaylor]

New Issue Checklist

• Updated SwiftLint to the latest version
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Bug Report

The prohibited_super_call rule generates an incorrect violation report when linting the providePlaceholder override for an NSFileProviderExtension implementation. The code to repro shown below is taken directly from the Apple template code generated for a new FileProvider extension target and does not call super.

Complete output when running SwiftLint, including the stack trace and command used

$ swiftlint --config swiftlint.yml 
Loading configuration from 'swiftlint.yml'
Linting Swift files in current working directory
Linting 'FileProviderExtension.swift' (1/1)
/Users/bestave/Desktop/DeleteMe/DeleteMeFP/ProhibitedSuperTest/FileProviderExtension.swift:5:99: warning: Prohibited calls to super Violation: Method 'providePlaceholder(at:completionHandler:)' should not call to super function (prohibited_super_call)
Done linting! Found 1 violation, 0 serious in 1 file.

Environment

• SwiftLint version: 0.25.1 (release and latest source)
• Installation method used: SwiftLint.pkg installer and also cloned/built from master source
• Paste your configuration file:

opt_in_rules:
  - prohibited_super_call

• Are you using [nested configurations]? No
• Which Xcode version are you using? 9.3.1
• Do you have a sample that shows the issue? Yes:

import FileProvider

public class FileProviderExtension: NSFileProviderExtension {

    override func providePlaceholder(at url: URL, completionHandler: @escaping (Error?) -> Void) {
        guard let identifier = persistentIdentifierForItem(at: url) else {
            completionHandler(NSFileProviderError(.noSuchItem))
            return
        }
    }

}