Improve step names

[garethr]

First up, thanks for writing this. I just used it successfully to install Conftest in one of my runs.

I think the step names could be improved

Note that "Download the CLI" out of context of the task doesn't tell the user which CLI is being installed. The names need to carry all of the context with them. I'd suggest instead "Installing Conftest"

Note:

• Install rather than download, simply because that's the name of the command
• Installing rather than install as the standard CircleCI output is written in present progressive

[kenfdev]

Thanks @garethr and apologies about the late response (github notifications aren't working well with me recently). Let me improve these this week!