Update README.md

README.md

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 ### Networking
 - Built-in simulation browser
 - Download and upload simulation files
-- Rate simulations by giving stars
+- Upvote simulations by giving stars
 
 # But for what is this useful?
 - A first attempt to answer: Feed your curiosity by watching evolution at work! As soon as self-replicating machines come into play and mutations are turned on, the simulation itself does everything.