Upgrade to embedded-redis:0.4 (fixes #113)

Embedded-Redis 0.4 got released; it now includes the latest versions of redis for win/mac/unix and 
therefor fixes the problems with 
ERR Unsupported CONFIG parameter: notify-keyspace-events #113

spring-session/build.gradle

@@ -22,7 +22,7 @@ dependencies {
     provided "javax.servlet:javax.servlet-api:$servletApiVersion"
     integrationTestCompile "redis.clients:jedis:2.4.1",
             "org.apache.commons:commons-pool2:2.2",
-            "redis.embedded:embedded-redis:0.2"
+            "redis.embedded:embedded-redis:0.4"
     testCompile 'junit:junit:4.11',
             'org.mockito:mockito-core:1.9.5',
             "org.springframework:spring-test:$springVersion",
@@ -93,4 +93,4 @@ test {
 }
 integrationTest {
     jvmArgs "-javaagent:${configurations.jacoco.asPath}=destfile=${buildDir}/jacoco.exec,includes=${project.group}.*"
-}
+}