Merge from aws/aws-sam-cli/develop

Merge from awslabs/aws-sam-cli/develop

Merge from awslabs/aws-sam-cli/develop

chore: Bump version to RC2 (aws#2104)

Version bump (aws#2080)

* chore: Bump AWS SAM CLI Version

* Change SAM CLI Version Number

There is a conflict betweeen PyPi documentation which asks for the
previous style
https://packaging.python.org/guides/distributing-packages-using-setuptools/#pre-release-versioning
and PEP 440 which proposes the style included in this change
https://www.python.org/dev/peps/pep-0440/#pre-releases - our MSI build
scripts failed on the pattern we were using before, this changes the
pattern.

Merge from awslabs/aws-sam-cli/develop

Merge from awslabs/aws-sam-cli/develop

Merge from awslabs/aws-sam-cli/develop

Merge from awslabs/aws-sam-cli/develop

Merge from awslabs/aws-sam-cli/develop