chore: merge pull request #1201 from awslabs/release/v1.15.1

Release/v1.15.1

chore: merge pull request #1174 from awslabs/release/v1.15.0

docs: merge pull request #1111 from praneetap/resource14

chore: merge release/v1.13.2 into master

chore: merge pull request #1069 from awslabs/release/v1.13.1

Release/v1.13.1

chore: merge release/v1.13.0 into master

chore: merge pull request #1000 from awslabs/release/v1.12.0

merge Release/v1.12.0 into master

chore: merge pull request #898 from awslabs/release/v1.11.0

chore: merge release/v1.11.0 into master

chore: merge release/v1.10.0 into master

Merge pull request #843 from awslabs/release/v1.10.0

feat: add AWS::Serverless::LayerVersion and AWS::Serverless::Applicat…

…ion (#688)