Added next release section to the changelog. [ci skip]
Added next release section to the changelog. [ci skip]

hamadata/aws-sdk-ruby,aws/aws-sdk-ruby,takeyuweb/aws-sdk-ruby,aws/aws-sdk-ruby,llooker/aws-sdk-ruby,cjyclaire/aws-sdk-ruby,takeyuweb/aws-sdk-ruby,llooker/aws-sdk-ruby,hamadata/aws-sdk-ruby,takeyuweb/aws-sdk-ruby,hamadata/aws-sdk-ruby,cjyclaire/aws-sdk-ruby,llooker/aws-sdk-ruby,cjyclaire/aws-sdk-ruby,aws/aws-sdk-ruby