Update README.md

Author: ismyrnow

README.md

@@ -4,7 +4,7 @@ leaflet-groupedlayercontrol
 Leaflet layer control with support for grouping overlays together.
 Also supports making groups exclusive (radio instead of checkbox).
 
-> This project is looking for a maintainer. Interested? Contact me on Twitter: [@ismyrnow](https://twitter.com/ismyrnow).
+> This project is looking for a maintainer. Interested? Open an issue.
 
 ![preview](preview.png)