Update README.md

ruby-concurrency · Feb 3, 2019 · b20a562 · b20a562
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 ## Thread Safety
 
 *Concurrent Ruby makes one of the strongest thread safety guarantees of any Ruby concurrency 
-library, providing consistent behavior and guarantees on all three of the main Ruby interpreters 
+library, providing consistent behavior and guarantees on all four of the main Ruby interpreters 
 (MRI/CRuby, JRuby, Rubinius, TruffleRuby).*
 
 Every abstraction in this library is thread safe. Specific thread safety guarantees are documented