Fix bugs with direct message api

direct_messages_api.go

@@ -82,6 +82,7 @@ func (c *Client) IndexDirectMessages(ctx context.Context, otherUserID string, re
 			query.Add("since_id", req.SinceID.String())
 		}
 	}
+	httpReq.URL.RawQuery = query.Encode()
 
 	var resp IndexDirectMessagesResponse
 	err = c.doWithAuthToken(ctx, httpReq, &resp)
@@ -127,7 +128,7 @@ func (c *Client) CreateDirectMessage(ctx context.Context, m *Message) (*Message,
 	}
 
 	var resp struct {
-		*Message `json:"message"`
+		*Message `json:"direct_message"`
 	}
 	err = c.doWithAuthToken(ctx, httpReq, &resp)
 	if err != nil {

json.go

@@ -150,11 +150,14 @@ type Attachment struct {
 	Loci            [][]int        `json:"loci,omitempty"`
 	UserIDs         []ID           `json:"user_ids,omitempty"`
 	URL             string         `json:"url,omitempty"`
+	FileID          string         `json:"file_id,omitempty"`
+	VideoPreviewURL string         `json:"preview_url,omitempty"`
 	Name            string         `json:"name,omitempty"`
 	Latitude        string         `json:"lat,omitempty"`
 	Longitude       string         `json:"lng,omitempty"`
 	Placeholder     string         `json:"placeholder,omitempty"`
 	Charmap         [][]int        `json:"charmap,omitempty"`
+	ReplyID         ID             `json:"reply_id,omitempty"`
 }
 
 func (a *Attachment) String() string {