Mention the ThreadLocal<SecureRandom> option

Updated notice about library obsolescence on Linux systems.

Author: Pr0methean

README.md

@@ -1,6 +1,6 @@
 # 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.**
+**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. On these systems, I recommend using a ThreadLocal<SecureRandom>.**
 
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