It’s a deprecation notice and shouldn’t do any harm. As Arkshine says, it’s connected to the move over to more group-enabled style settings, so you will likely see more as that effort continues. 
「いいね！」 2
It’s a deprecation notice and shouldn’t do any harm. As Arkshine says, it’s connected to the move over to more group-enabled style settings, so you will likely see more as that effort continues.