Undo last commit, driver 2.5.0 isn't released yet

Author: estolfo

lib/mongoid/query_cache.rb

@@ -222,7 +222,7 @@ def each
           super
         else
           unless cursor = cached_cursor
-            server = server_selector.select_server(cluster)
+            server = read.select_server(cluster)
             cursor = CachedCursor.new(view, send_initial_query(server), server)
             QueryCache.cache_table[cache_key] = cursor
           end