Output version name

[Madis0]

Is your feature request related to a problem? Please describe.
You currently have tag_name and downloaded_files as options, but there could be more.

Describe the solution you'd like
version_name

Describe alternatives you've considered
N/A

Additional context
For example, in your case it would output "Release Downloader v1.8" instead of "v1.8".

https://github.com/robinraju/release-downloader/releases/tag/v1.8

[robinraju]

As per Github api, this field is called as name inside the release object,
I've added an output variable named release_name in #677