Update README.md (#65)

Updated version to current in image spec example. Please note that image spec definition is optional and default to current release image from default docker repository, if not otherwise specified.

Author: ruslan-redislabs

README.md

@@ -154,7 +154,7 @@ Redis Image
   redisEnterpriseImageSpec:
     imagePullPolicy:  IfNotPresent
     repository:       redislabs/redis
-    versionTag:       5.4.2-27
+    versionTag:       5.4.6-17
 ```
 
 Persistence