Make some edits

README.md

@@ -75,7 +75,7 @@ func main() {
 
    	// or  
    	var todo2 Todo     
-	err = httpClient.Do(request).To(&todo2)
+	response, err = httpClient.Do(request).To(&todo2)
 	if err != nil {
 		fmt.Println(todo.Title) // Lorem ipsum dolor sit amet
 	} else {

client.go

@@ -157,10 +157,10 @@ func (h httpClient) Do(request *http.Request) ServiceResponse {
 }
 
 // To func returns converts string to struct
-func (s ServiceResponse) To(value interface{}) error {
+func (s ServiceResponse) To(value interface{}) (ServiceResponse, error) {
 	if s.Data != "" {
-		return json.Unmarshal([]byte(s.Data), &value)
+		return s, json.Unmarshal([]byte(s.Data), &value)
 	}
 
-	return errors.New("response body cannot be empty")
+	return s, errors.New("response body cannot be empty")
 }

client_test.go

@@ -112,7 +112,7 @@ func TestGetRequestWithTo(t *testing.T) {
 
 		var got Todo
 		want := 10
-		err := httpClient.Do(request).To(&got)
+		_, err := httpClient.Do(request).To(&got)
 		if err != nil {
 			t.Error(err.Error())
 		}