Fix a couple of references to 0.19

I didn't review the diff closely enough.

Author: bbatsov

README.md

@@ -182,7 +182,7 @@ You can easily boot an nREPL server with the CIDER middleware loaded
 with the following "magic" incantation:
 
 ```
-clj -Sdeps '{:deps {cider/cider-nrepl {:mvn/version "0.19.0-SNAPSHOT"} }}' -e '(require (quote cider-nrepl.main)) (cider-nrepl.main/init ["cider.nrepl/cider-middleware"])'
+clj -Sdeps '{:deps {cider/cider-nrepl {:mvn/version "0.18.0-SNAPSHOT"} }}' -e '(require (quote cider-nrepl.main)) (cider-nrepl.main/init ["cider.nrepl/cider-middleware"])'
 ```
 
 Note that `clj` was introduced in Clojure 1.9.

test/smoketest/project.clj

@@ -1,6 +1,6 @@
 (defproject smoketest "0.1.0-SNAPSHOT"
   :dependencies [[nrepl "0.4.2"]
-                 [cider/cider-nrepl "0.19.0-SNAPSHOT"]]
+                 [cider/cider-nrepl "0.18.0-SNAPSHOT"]]
   :exclusions [org.clojure/clojure]
   :profiles {:1.7 {:dependencies [[org.clojure/clojure "1.7.0"]]}
              :1.8 {:dependencies [[org.clojure/clojure "1.8.0"]]}