Update README.md

Author: monkstone

README.md

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 # geomerative gem
-Gem wrapper for Ricard Marxer Geomerative library for processing-3.0 and JRubyArt
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+[![Gem Version](https://badge.fury.io/rb/geomerative.svg)](https://badge.fury.io/rb/geomerative)
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+Gem wrapper for Ricard Marxer Geomerative library for processing-3.0 and JRubyArt, paradoxically sketches seem to need `--nojruby` flag to run (which is supposed not to work with gems see README.md with examples).