wskdeploy runtime specification does not work with compose.

[style95]

This kind of runtime specification does not work with a compose based setup

packages:
  hello_world_package:
    version: 1.0
    license: Apache-2.0
    actions:
      hello_world:
        function: src/hello.py
        runtime: python@3

while this manifest works as expected.

packages:
  hello_world_package:
    version: 1.0
    license: Apache-2.0
    actions:
      hello_world:
        function: src/hello.py
        runtime: python:3

Users need to specify the runtime in this format: runtime:version.
But wskdeploy guides it with @.
https://github.com/apache/openwhisk-wskdeploy/blob/master/specification/html/spec_actions.md#valid-runtime-names

[style95]

I confirmed @ works as expected with native setup.