Update README.md: now obsolete

Author: Pr0methean

README.md

@@ -1,4 +1,7 @@
 # More randomness. Less time. Still an instance of java.util.Random.
+
+**Notice: This library is considered obsolete on [Linux 5.17 and newer](https://www.phoronix.com/news/Linux-getrandom-8450p) because each CPU core now has its own entropy pool, and the overhead of a system call is now at least as cheap as a communication between threads.**
+
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