Doc-deprecate

Ref Level/community#113

README.md

@@ -2,7 +2,7 @@
 
 **An abstract prototype matching the [`leveldown`][leveldown] API. Useful for extending [`levelup`](https://github.com/Level/levelup) functionality by providing a replacement to `leveldown`.**
 
-> :pushpin: This module is in maintenance mode. We're gradually replacing it with [`abstract-level`](https://github.com/Level/abstract-level).
+> :pushpin: This module will soon be [deprecated](https://github.com/Level/community/issues/113), because it is superseded by [`abstract-level`](https://github.com/Level/abstract-level).
 
 [![level badge][level-badge]](https://github.com/Level/awesome)
 [![npm](https://img.shields.io/npm/v/abstract-leveldown.svg)](https://www.npmjs.com/package/abstract-leveldown)