Fix typo in README

Author: gfredericks

README.org

@@ -62,7 +62,7 @@ Previous versions available as
 
 The main HTTP client functionality is provided by the =clj-http.client= namespace.
 
-First, require it in the REPS:
+First, require it in the REPL:
 
 #+BEGIN_SRC clojure
 (require '[clj-http.client :as client]')