added test caption

src/dispatching/dispatchers/filter/filters/text.rs

@@ -9,7 +9,12 @@ impl Filter<Message> for MessageTextFilter {
     fn test(&self, value: &Message) -> bool {
         match value.text() {
             Some(text) => self.text == text,
-            None => false
+            None => {
+                match value.caption() {
+                    Some(caption) => self.text == caption,
+                    None => false
+                }
+            }
         }
     }
 }