Update README.md

mtgrosser · Mar 8, 2019 · 8d80365 · 8d80365
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 ## Thread safety
 
-As of version 0.4.0, Rszr is thread safe through the Ruby GIL.
+As of version 0.5.0, Rszr is thread safe through Ruby's global VM lock.
 Use of any previous versions in a threaded environment is discouraged.
 
 ## Speed