Update README.md

Author: monkstone

README.md

@@ -16,8 +16,7 @@ Build fails because latest processing is not available from maven central.
 
 [Box2D for processing on github][]
 
-Downloads including examples [zip][] and [tar][]
-
+Downloads including examples [zip][]
 [Wiki][]
 
 ### Licensing
@@ -62,6 +61,5 @@ The other thing you should know is there is a mismatch between the physics world
 [Nature of Code book]:http://natureofcode.com/
 [Sandi Metz]:http://www.poodr.com/
 [this book]:http://www.crcpress.com/product/isbn/9781466565760
-[zip]:https://github.com/ruby-processing/jbox2d/archive/0.9.1.zip
-[tar]:https://github.com/ruby-processing/jbox2d/archive/0.9.1.tar.gz
+[zip]:https://github.com/ruby-processing/jbox2d/archive/master.zip
 [Wiki]:https://github.com/ruby-processing/jbox2d/wiki