Command github-release-get downloads single asset from the latest published
release of given github repository.

It downloads first asset matching given pattern of the latest published
github release to the current directory; it stops if file with such name
already exists. For pattern matching see https://golang.org/pkg/path/#Match

Upon successful download it prints name of the downloaded file to stdout.

To access private repositories pass oAuth token via GITHUB_TOKEN environment
variable, see https://github.com/settings/tokens page.