Add note about netty 4.2

Author: normanmaurer

README.md

@@ -2,63 +2,4 @@
 
 # Netty io_uring
 
-The new io_uring interface added to the Linux Kernel 5.1 is a high I/O performance scalable interface for fully asynchronous Linux syscalls
-
-## Requirements:
-
-- x86-64 / aarch64 processor
-- at least 5.9
-- to run the tests, you have to increase memlock(default 64K)
-
-
-See [our wiki page](https://netty.io/wiki/native-transports.html).
-
-## How to include the dependency
-
-To include the dependency you need to ensure you also specify the right classifier. At the moment we only support linux
- x86_64 and aarch_64 but this may change. 
- 
-As an example this is how you would include the dependency in maven for x86_64:
-```
-<dependency>
-    <groupId>io.netty.incubator</groupId>
-    <artifactId>netty-incubator-transport-native-io_uring</artifactId>
-    <version>0.0.21.Final</version>
-    <classifier>linux-x86_64</classifier>
-</dependency>
-```
-
-And in gradle:
-```
-dependencies {
-    implementation 'io.netty.incubator:netty-incubator-transport-native-io_uring:0.0.21.Final:linux-x86_64'
-}
-```
-
-## FAQ
-
-### I tried to use io_uring but got `java.lang.RuntimeException: failed to create io_uring ring fd Cannot allocate memory`
-
-When you tried to use io_uring but saw an exception that looked like this please try to encreate the [memlock limit](https://access.redhat.com/solutions/61334) for the user that tries to use io_uring:
-
-
-```
-Exception in thread "main" java.lang.UnsatisfiedLinkError: failed to load the required native library
-	at io.netty.incubator.channel.uring.IOUring.ensureAvailability(IOUring.java:63)
-        ...
-        ...
-Caused by: java.lang.RuntimeException: failed to create io_uring ring fd Cannot allocate memory
-	at io.netty.incubator.channel.uring.Native.ioUringSetup(Native Method)
-	at io.netty.incubator.channel.uring.Native.createRingBuffer(Native.java:141)
-	at io.netty.incubator.channel.uring.Native.createRingBuffer(Native.java:174)
-	at io.netty.incubator.channel.uring.IOUring.<clinit>(IOUring.java:36)
-	... 17 more
-```
-
-
-You can check your current memlock settings by
-
-```
-$ ulimit -l
-65536
-```
+This repository was archived and io_uring support was merged into [netty 4.2 branch](https://github.com/netty/netty/tree/4.2).