Add config option for plaintext highlight bridging

example-config.yaml

@@ -89,6 +89,10 @@ bridge:
     # Use inline images instead of m.image to make rich captions possible.
     # N.B. Inline images are not supported on all clients (e.g. Riot iOS).
     inline_images: false
+    # Whether or not to bridge plaintext highlights.
+    # Only enable this if your displayname_template has some static part that the bridge can use to
+    # reliably identify what is a plaintext highlight.
+    plaintext_highlights: false
 
     # The prefix for commands. Only required in non-management rooms.
     command_prefix: "!tg"