feat: warn swift

Author: loks0n

templates/swift/Sources/Client.swift.twig

@@ -321,6 +321,13 @@ open class Client {
             timeout: .seconds(30)
         )
 
+        let warnings = response.headers["x-{{ spec.title | lower }}-warning"].first
+        if warnings != nil {
+            warnings!.split(separator: ";").forEach { warning in
+                print("Warning: \(warning)")
+            }
+        }
+
         switch response.status.code {
         case 0..<400:
             switch T.self {