Add Swiftlint

Sources/ResgenSwift/Images/Generator/ImageExtensionGenerator.swift

@@ -29,7 +29,7 @@ class ImageExtensionGenerator {
         let extensionFilePathURL = URL(fileURLWithPath: extensionFilePath)
         do {
             try extensionContent.write(to: extensionFilePathURL, atomically: false, encoding: .utf8)
-        } catch (let error) {
+        } catch let error {
             let error = ImagesError.writeFile(extensionFilePath, error.localizedDescription)
             print(error.description)
             Images.exit(withError: error)