update ruby doc related to encrypted volumes
Merge pull request #591 from scalp42/encrypted

update ruby doc related to encrypted volumes
Added support to AWS::SQS::ReceivedMessage for request ID.
Tightened the SigningCertURL validation for SNS messages.
API Updates for Auto Scaling

This release of Auto Scaling adds support for detaching instances from
an Auto Scaling group, and putting instances that are currently in
service into a Standby state.
API Update for AWS CloudTrail
API Updates for Amazon EC2

Mark certain parameters as required.
API Update for Amazon Route 53

You now can configure Amazon Route 53 to respond to DNS queries based on
the geographic location that the queries originate from.
API Updates for Amazon ElastiCache

Starting today, you can create ElastiCache for Memcached clusters with
nodes in multiple availability zones, which will improve the cluster’s
reliability by minimizing potential impact of AZ disruption on the
cluster.
Tag release v1.50.0

References:
  #590, #591
Merge pull request #592 from bosmanx/request-id

Added support to AWS::SQS::ReceivedMessage for request ID.
API Updates for Elastic Load Balancing

Adds support for tagging to Elastic Load Balancing.
Tag release v1.51.0

References:
  #592