Add /mute to command for setting the token in the readme
Fixes
@@ -174,9 +174,12 @@ If you set the token option yourself, you should separate the tokens with
commas.
```
-/set plugins.var.python.slack.slack_api_token <token1>,<token2>,<token3>
+/mute /set plugins.var.python.slack.slack_api_token <token1>,<token2>,<token3>
```
+The `/mute` prefix is to prevent "Option changed ..." from being printed to the
+core buffer, so your token is not logged in your buffer logs.
+
#### Optional: Secure the tokens
The tokens you add will be stored as plain text in the option
