Set version-added for new parameters in ec2_elb_lb and elasticache

cloud/ec2_elb_lb

@@ -56,6 +56,7 @@ options:
       - A list of security groups to apply to the elb
     require: false
     default: None
+    version_added: "1.6"
   health_check:
     description:
       - An associative array of health check configuration settigs (see example)

cloud/elasticache

@@ -63,6 +63,7 @@ options:
       - A list of vpc security group names to associate with this cache cluster. Only use if inside a vpc
     required: false
     default: ['default']
+    version_added: "1.6"
   cache_security_groups:
     description:
       - A list of cache security group names to associate with this cache cluster