doc: mark node.js 0.12 as end-of-life release

Signed-off-by: Ilkka Myller <ilkka.myller@nodefield.com>

Author: imyller

README.md

@@ -9,7 +9,7 @@ OpenEmbedded layer for latest [Node.js](https://nodejs.org/ "Node.js") releases.
 
  * ![LTS 6](https://img.shields.io/badge/Node.js%20LTS-6.10.0-blue.svg)
  * ![LTS 4](https://img.shields.io/badge/Node.js%20LTS-4.8.0-blue.svg)
- * ![Maintenance 0.12](https://img.shields.io/badge/Node.js%20Maintenance-0.12.18-lightgray.svg)
+ * ![End of life 0.12](https://img.shields.io/badge/Node.js%20End%20of%20Life-0.12.18-lightgray.svg)
  * ![End of life 0.10](https://img.shields.io/badge/Node.js%20End%20of%20Life-0.10.48-lightgray.svg)
  * ![End of life 0.8](https://img.shields.io/badge/Node.js%20End%20of%20Life-0.8.28-lightgrey.svg)