Change namespace to ring.websocket.*

This fits in better with other libraries like ring.websocket.transit,
and the 'websocket' part of the name feels more significant than the
'middleware' part. In addition, the naming prefix of the function, i.e.
wrap-, also indicates the function is middleware.

src/ring/middleware/websocket_keepalive.clj → src/ring/websocket/keepalive.clj

@@ -1,4 +1,4 @@
-(ns ring.middleware.websocket-keepalive
+(ns ring.websocket.keepalive
   (:require [ring.websocket :as ws]
             [ring.websocket.protocols :as wsp])
   (:import [java.util.concurrent

test/ring/middleware/websocket_keepalive_test.clj → test/ring/websocket/keepalive_test.clj

@@ -1,8 +1,8 @@
-(ns ring.middleware.websocket-keepalive-test
+(ns ring.websocket.keepalive-test
   (:require [clojure.test :refer [deftest is testing]]
             [ring.websocket :as ws]
             [ring.websocket.protocols :as wsp]
-            [ring.middleware.websocket-keepalive :as ka]))
+            [ring.websocket.keepalive :as ka]))
 
 (deftest test-websocket-keepalive-request
   (testing "websocket pings"