Commentron json params are usually underscored instead of camel-cased.
Double-checked commentron code:
```
// MentionedChannel channels mentioned in comment
type MentionedChannel struct {
ChannelName string `json:"channel_name"`
ChannelID string `json:"channel_id"`
}
```
The parameter should probably also be skipped instead of sending empty array, but leaving as-is for now since that is minor.
7989020a04