Add in progression to the raml

[jonyeezs]

Octopus api has a resource to get the release progression of a project: https://github.com/OctopusDeploy/OctopusDeploy-Api/wiki/Progressions

Could this client support that?

I'm not sure what version of the api has this call.

[brentm5]

Yes we accept PRs! All you would have to do is update the RAML to add the endpoint. If everything looks good I can merge and publish another version of this.