Increase memory dedicated for Memcached from 64MB to 256MB

PROD-32800

Change-Id: I8e3fa7c675100ed9b5ec263ac00a773c521df9c1
diff --git a/README.rst b/README.rst
index 61b9d06..c32fe73 100644
--- a/README.rst
+++ b/README.rst
@@ -15,7 +15,7 @@
     memcached:
       server:
         enabled: true
-        cache_size: 64
+        cache_size: 256
         slabsize: 1m
         bind:
           address: 0.0.0.0
@@ -30,7 +30,7 @@
     memcached:
       server:
         enabled: true
-        cache_size: 64
+        cache_size: 256
         slabsize: 2m
         threads: 1
         bind: