docs(example): fix usage example of client.Raw() (#5)

* docs(example): fix usage example of client.Raw()

* docs(readme): improve raw example output

readme.md

@@ -88,10 +88,8 @@ func main() {
 If you don't want to use structs, you use `Raw()` to use maps for both input (variables) and output (response data).
 
 ```go
-client := gqlclient.New("https://metaphysics-production.artsy.net")
-
-resp, err := client.Send(&data, query, map[string]interface{}{
-	ID: "55bfed9275de7b060098b9bc",
+resp, err := client.Raw(query, map[string]interface{}{
+  "id": "55bfed9275de7b060098b9bc",
 })
 
 if err != nil {
@@ -101,9 +99,9 @@ if err != nil {
 log.Printf("data: %+v", resp.Data)
 // Output:
 // data: map[
-//   article:map[
-//	 id:55bfed9275de7b060098b9bc
-//	 title:How the 1960s’ Most Iconic Artists Made Art Contemporary
+//   article: map[
+//	   id: 55bfed9275de7b060098b9bc
+//	   title: How the 1960s’ Most Iconic Artists Made Art Contemporary
 //   ]
 // ]
 ```