Update README.md

Author: ebertin

README.md

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 visiomatic
 ==========
 
-a web client for visualizing science-grade astronomy images
-Instruction and demos at [visiomatic.org](http://visiomatic.org)
+a web client for visualizing science-grade astronomy images.
+
+Instruction and demos available at [visiomatic.org](http://visiomatic.org)
+
+Only interested in an [IIPImage](http://iipimage.sourceforge.net) plugin for [leaflet](http://leafletjs.com)? Try [Leaflet.TileLayer.IIP](https://github.com/astromatic/Leaflet.TileLayer.IIP)