update README to also pull down hammer-cli-foreman-tasks
fixes #5600 - fix host-collection copy command

The command was missing the arguments/parameters; therefore,
user couldn't actually copy a host collection.
Merge pull request #160 from dustint-rh/update_readme_with_tasks

update README to also pull down hammer-cli-foreman-tasks
Merge pull request #161 from bbuckingham/issue-5600

fixes #5600 - fix host-collection copy command