Delete unused PrivateMessageService

Signed-off-by: Vartan Benohanian <vartanbeno@gmail.com>

private-messages.go

@@ -1,35 +0,0 @@
-package reddit
-
-import (
-	"context"
-	"net/http"
-	"net/url"
-)
-
-// PrivateMessageService handles communication with the private message
-// related methods of the Reddit API
-type PrivateMessageService interface {
-	BlockUser(ctx context.Context, messageID string) (*Response, error)
-}
-
-// PrivateMessageServiceOp implements the PrivateMessageService interface
-type PrivateMessageServiceOp struct {
-	client *Client
-}
-
-var _ PrivateMessageService = &PrivateMessageServiceOp{}
-
-// BlockUser blocks a user based on the ID of the private message
-func (s *PrivateMessageServiceOp) BlockUser(ctx context.Context, messageID string) (*Response, error) {
-	path := "api/block"
-
-	form := url.Values{}
-	form.Set("id", messageID)
-
-	req, err := s.client.NewRequestWithForm(http.MethodPost, path, form)
-	if err != nil {
-		return nil, nil
-	}
-
-	return s.client.Do(ctx, req, nil)
-}