[Fix #2123] Add a changelog entry for the Java 9 version handling fix

See clojure-emacs/cider-nrepl#462 for details.

Author: bbatsov

CHANGELOG.md

@@ -23,6 +23,7 @@
 * [#1651](https://github.com/clojure-emacs/cider/issues/1651), [cider-nrepl#445](https://github.com/clojure-emacs/cider-nrepl/pull/455): Fix `cider-expected-ns` returns `nil` on boot projects.
 * [#2120](https://github.com/clojure-emacs/cider/issues/2120): Fix Travis CI build errors for Emacs versions >25.2.
 * [#2117](https://github.com/clojure-emacs/cider/pull/2117): Ensure `cider-repl-result-prefix` is only inserted before the first result chunk.
+* [#2123](https://github.com/clojure-emacs/cider/issues/2123): Process properly the Java version in Java 9.
 
 ## 0.15.1 (2017-09-13)