introduce CorrectableRule protocol and Linter.correct()

Source/SwiftLintFramework/Models/Linter.swift

@@ -10,6 +10,10 @@ import Foundation
 import SwiftXPC
 import SourceKittenFramework
 
+private func correctableRules() -> [CorrectableRule] {
+    return []
+}
+
 public struct Linter {
     private let file: File
     private let rules: [Rule]
@@ -32,4 +36,8 @@ public struct Linter {
         rules = configuration.rules
         reporter = configuration.reporterFromString
     }
+
+    public func correct() {
+        correctableRules().forEach { $0.correctFile(file) }
+    }
 }

Source/SwiftLintFramework/Protocols/Rule.swift

@@ -18,3 +18,7 @@ public protocol ParameterizedRule: Rule {
     init(parameters: [RuleParameter<ParameterType>])
     var parameters: [RuleParameter<ParameterType>] { get }
 }
+
+public protocol CorrectableRule: Rule {
+    func correctFile(file: File)
+}