Add support for 'refresh' in @cached section of the query.

Example:

```
query MyProducts @cached(refresh: true) {
  products {
    id
    name
  }
}
```

graphql.go

@@ -134,6 +134,9 @@ func parseGraphQLQuery(c *fiber.Ctx) (operationType, operationName string, cache
 								return
 							}
 						}
+						if arg.Name.Value == "refresh" {
+							cacheRequest = arg.Value.GetValue().(bool)
+						}
 					}
 				}
 			}