Update schema to support showEnvironmentBlock (#350)
Update schema to support showEnvironmentBlock (#350)

* Update schema to support showEnvironmentBlock

Microsoft/vsts-task-lib,Microsoft/vso-task-lib,Microsoft/vsts-task-lib,Microsoft/vso-task-lib,Microsoft/vsts-task-lib,Microsoft/vsts-task-lib,Microsoft/vso-task-lib,Microsoft/vsts-task-lib