Remove outdated release notes

Author: gnodet

README.md

@@ -12,14 +12,3 @@ For publishing [the site](https://codehaus-plexus.github.io/plexus-io/) do the f
 ```
 mvn -Preporting verify site-deploy
 ```
-
-## Release Notes
-
-You can find details about the different releases in the
-[Release Notes](https://github.com/codehaus-plexus/plexus-io/blob/master/ReleaseNotes.md).
-
- * [Release 3.2.0](https://github.com/codehaus-plexus/plexus-io/blob/master/ReleaseNotes.md#plexus-io-320).
- * [Release 3.1.1](https://github.com/codehaus-plexus/plexus-io/blob/master/ReleaseNotes.md#plexus-io-311).
- * [Release 3.1.0](https://github.com/codehaus-plexus/plexus-io/blob/master/ReleaseNotes.md#plexus-io-310).
- * [Release 3.0.1](https://github.com/codehaus-plexus/plexus-io/blob/master/ReleaseNotes.md#plexus-io-301).
- * [Release 3.0.0](https://github.com/codehaus-plexus/plexus-io/blob/master/ReleaseNotes.md#plexus-io-300).