Support protocol version 2.0.0 to callback handlers orchestrated by C…

…loudFormation service (aws-cloudformation#279)

* Support protocol version 2.0.0 to callback handlers orchestrated by cloudformation service

* Add protocol version and require java plugin version to be 2.0.0 or above

Co-authored-by: John Tompkins <jotompki@amazon.com>

Bumping the version (aws-cloudformation#261)

Bumping the version (aws-cloudformation#248)

* Bumping the version

* Bump the version for init

Bump version for pom.xml fix (aws-cloudformation#237)

Version bump extravaganza. (aws-cloudformation#220)

* Version bump extravaganza (trying to keep in sync)

* Bumping aws sdk again

Co-authored-by: John Tompkins <jotompki@amazon.com>

Static HTTP client to prevent new connection pools each request (aws-…

…cloudformation#219)

Bump version for release (aws-cloudformation#213)