Bump the injected nREPL version

Author: bbatsov

cider.el

@@ -412,7 +412,7 @@ Throws an error if PROJECT-TYPE is unknown."
   "List of dependencies where elements are lists of artifact name and version.")
 (put 'cider-jack-in-dependencies 'risky-local-variable t)
 
-(defcustom cider-injected-nrepl-version "0.9.0-beta3"
+(defcustom cider-injected-nrepl-version "0.9.0-beta4"
   "The version of nREPL injected on jack-in.
 We inject the newest known version of nREPL just in case
 your version of Boot or Leiningen is bundling an older one."