fixed bug in send method

* with signal-cli 0.13.0 the default behavior changed
  and message to oneself did not trigger a notification anymore.

  As this is a behavioral change and we try to avoid any behavioral
  changes in the REST API, the previous behavior was reinstated again
  by explicitly adding "--notify-self".

see #511

src/client/client.go

@@ -410,6 +410,7 @@ func (s *SignalClient) send(number string, message string,
 			QuoteMentions  []string `json:"quote-mentions,omitempty"`
 			TextStyles     []string `json:"text-style,omitempty"`
 			EditTimestamp  *int64   `json:"edit-timestamp,omitempty"`
+			NotifySelf     bool     `json:"notify-self,omitempty"`
 		}
 
 		request := Request{Message: message}
@@ -422,6 +423,8 @@ func (s *SignalClient) send(number string, message string,
 			request.Attachments = append(request.Attachments, attachmentEntry.toDataForSignal())
 		}
 
+		request.NotifySelf = true
+
 		request.Sticker = sticker
 		if mentions != nil {
 			request.Mentions = make([]string, len(mentions))
@@ -518,6 +521,8 @@ func (s *SignalClient) send(number string, message string,
 			cmd = append(cmd, strconv.FormatInt(*editTimestamp, 10))
 		}
 
+		cmd = append(cmd, "--notify-self")
+
 		rawData, err := s.cliClient.Execute(true, cmd, message)
 		if err != nil {
 			cleanupAttachmentEntries(attachmentEntries)