Update bridge table

Author: tulir

README.md

@@ -86,16 +86,16 @@ used with the `--type` flag.
 | [mautrix-discord]    | discord                              |
 | [mautrix-slack]      | slack                                |
 | [mautrix-gmessages]  | gmessages,  googlemessages, rcs, sms |
-| †[mautrix-meta]      | meta, instagramgo, facebookgo        |
-| [mautrix-facebook]   | facebook                             |
-| [mautrix-instagram]  | instagram                            |
+| [mautrix-meta]       | meta, instagramgo, facebookgo        |
+| †[mautrix-facebook]  | facebook                             |
+| †[mautrix-instagram] | instagram                            |
 | [mautrix-googlechat] | googlechat, gchat                    |
 | [mautrix-twitter]    | twitter                              |
 | [mautrix-imessage]   | imessage                             |
-| [beeper-imessage]    | imessagego                           |
+| †[beeper-imessage]   | imessagego                           |
 | [heisenbridge]       | heisenbridge, irc                    |
 
-† indicates a new/experimental bridge that will likely have bugs
+† indicates legacy bridge that is no longer actively maintained
 
 [mautrix-telegram]: https://github.com/mautrix/telegram
 [mautrix-whatsapp]: https://github.com/mautrix/whatsapp