Release v1.20.20

Release v1.20.20 (2019-07-12)

Service Client Updates

• service/apigatewayv2: Updates service API
• aws/endpoints: Updated Regions and Endpoints metadata.
• service/es: Updates service API
  • Amazon Elasticsearch Service now supports M5, C5, and R5 instance types.
• service/iam: Updates service API
  • Removed exception that was indicated but never thrown for IAM GetAccessKeyLastUsed API
• service/robomaker: Updates service API and documentation