Fixes SwiftLint warnings (#325)

Author: simonbs

Example/Example/Main/MainViewController.swift

@@ -5,7 +5,7 @@ import UIKit
 final class MainViewController: UIViewController {
     override var textInputContextIdentifier: String? {
         // Returning a unique identifier makes iOS remember the user's selection of keyboard.
-        return "RunestoneExample.Main"
+        "RunestoneExample.Main"
     }
 
     private let contentView = MainView()

Sources/Runestone/TextView/Core/TextInputStringTokenizer.swift

@@ -28,12 +28,6 @@ final class TextInputStringTokenizer: UITextInputStringTokenizer {
         }
     }
 
-    override func isPosition(_ position: UITextPosition,
-                             withinTextUnit granularity: UITextGranularity,
-                             inDirection direction: UITextDirection) -> Bool {
-        super.isPosition(position, withinTextUnit: granularity, inDirection: direction)
-    }
-
     override func position(from position: UITextPosition,
                            toBoundary granularity: UITextGranularity,
                            inDirection direction: UITextDirection) -> UITextPosition? {
@@ -47,12 +41,6 @@ final class TextInputStringTokenizer: UITextInputStringTokenizer {
             return super.position(from: position, toBoundary: granularity, inDirection: direction)
         }
     }
-
-    override func rangeEnclosingPosition(_ position: UITextPosition,
-                                         with granularity: UITextGranularity,
-                                         inDirection direction: UITextDirection) -> UITextRange? {
-        super.rangeEnclosingPosition(position, with: granularity, inDirection: direction)
-    }
 }
 
 // MARK: - Lines
@@ -129,7 +117,7 @@ private extension TextInputStringTokenizer {
     private func isPosition(_ position: UITextPosition, atParagraphBoundaryInDirection direction: UITextDirection) -> Bool {
         // I can't seem to make Ctrl+A, Ctrl+E, Cmd+Left, and Cmd+Right work properly if this function returns anything but false.
         // I've tried various ways of determining the paragraph boundary but UIKit doesn't seem to be happy with anything I come up with ultimately leading to incorrect keyboard navigation. I haven't yet found any drawbacks to returning false in all cases.
-        return false
+        false
     }
 
     private func position(from position: UITextPosition, toParagraphBoundaryInDirection direction: UITextDirection) -> UITextPosition? {

Tests/RunestoneTests/TextInputStringTokenizerTests.swift

@@ -253,7 +253,7 @@ extension TextInputStringTokenizerTests {
 private extension TextInputStringTokenizerTests {
     private var sampleText: String {
         // swiftlint:disable line_length
-        return """
+        """
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