Add bot_avatar config field

example-config.yaml

@@ -41,14 +41,17 @@ appservice:
         # The prefix to use in the provisioning API endpoints.
         prefix: /_matrix/provision/v1
         # The shared secret to authorize users of the API.
-        # If you leave the default token, a random token will be generated and saved at startup.
-        shared_secret: "Very secret shared secret"
+        # Set to "generate" to generate and save a new token.
+        shared_secret: generate
 
     # The unique ID of this appservice.
     id: telegram
     # Username of the appservice bot.
     bot_username: telegrambot
+    # Display name and avatar for bot. Set to "remove" to remove display name/avatar, leave empty
+    # to leave display name/avatar as-is.
     bot_displayname: Telegram bridge bot
+    bot_avatar: mxc://maunium.net/tJCRmUyJDsgRNgqhOgoiHWbX
 
     # Authentication tokens for AS <-> HS communication. Autogenerated; do not modify.
     as_token: "This value is generated when generating the registration"