Try was supposed to be `try?` (#830)

src/Language/Swift.ts

@@ -1050,7 +1050,7 @@ ${this.accessLevel}class JSONAny: Codable {
             completionHandler(nil, response, error)
             return
         }
-        completionHandler(try! JSONDecoder().decode(T.self, from: data), response, nil)
+        completionHandler(try? JSONDecoder().decode(T.self, from: data), response, nil)
     }
 }`);
             this.ensureBlankLine();