Elixir CI

Another example with case and implementation of help #538

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4 errors and 2 warnings

test Onigumo.CLI.main/1 run CLI 'downloader' with "--working-dir" switch (OnigumoCLITest)

test Onigumo.CLI.main/1 run CLI with 'downloader' argument passing cwd (OnigumoCLITest)

test Onigumo.CLI.main/1 run CLI 'downloader' with "-C" switch (OnigumoCLITest)

Process completed with exit code 2.

0..-1 has a default step of -1, please write 0..-1//-1 instead

negative steps are not supported in Enum.slice/2, pass 0..-1//1 instead