Update README.md

Deprecating clusterkraf

README.md

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+# DEPRECATED
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+Don't use this. The Maps v3 SDK [handles markers](https://developers.google.com/maps/articles/toomanymarkers). That with a few other [cool utilities](http://googlegeodevelopers.blogspot.com/2014/02/marker-clustering-and-heatmaps-new.html) make this library obsolete!
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 # Clusterkraf
 
 A clustering library for the Google Maps Android API v2.
 
 If you're using the [Polaris v2](https://github.com/cyrilmottier/Polaris2) library, check out our [pleiades](https://github.com/twotoasters/clusterkraf/tree/pleiades) branch.
 
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 ## Features
 
 - Clustering based on pixel proximity, not grid membership