fix for issue 187:use repository.clone_url in TriggerBinding

[sudhishmk]

Title -: fix(triggers): use repository.clone_url in TriggerBinding

Summary

• Change TriggerBinding git-repo-url from body.repository.url to body.repository.clone_url
• Update the matching example in README.md
  GitHub's repository.url is the API URL (https://api.github.com/repos/...), which git-clone cannot use. clone_url is the HTTPS clone URL the pipeline needs.
  Closes Trigger Binding - body.repository.clone_url #187

[openshift-ci]

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