Update the Clojure version requirement

Author: bbatsov

README.md

@@ -701,7 +701,7 @@ change `*cider-repl localhost*` to `*cider-repl foo*`.
 
 * [Leiningen](http://leiningen.org) 2.x (only for `cider-jack-in`)
 * [GNU Emacs](http://www.gnu.org/software/emacs/emacs.html) 24.1+.
-* [Clojure](http://clojure.org) 1.4.0+
+* [Clojure](http://clojure.org) 1.5.0+
 
 ## Caveats