fix: Fixed example in README.md

Most likely the intent of this lambda was to return an object, and not to have a code-block with labels.

README.md

@@ -507,7 +507,7 @@ You can also specify uploading options to multer this way:
 
 ```typescript
 // to keep code clean better to extract this function into separate file
-export const fileUploadOptions = () => {
+export const fileUploadOptions = () => ({
     storage: multer.diskStorage({
         destination: (req: any, file: any, cb: any) => { ...
         },
@@ -520,7 +520,7 @@ export const fileUploadOptions = () => {
         fieldNameSize: 255,
         fileSize: 1024 * 1024 * 2
     }
-};
+});
 
 // use options this way:
 @Post("/files")