No output testing

[MCJOHN974]

In github jobs we just test that eo program correctly compiled and runs without failure. But we don't test that output is correct. @yegor256 if you think that this additional check is proper to this repo I added it in #6

[Graur]

@MCJOHN974 Good idea, but I think it will be better to do it in more canonical way: to add app-test.eo in test folder of sandbox project and test output like this:

[] > output-test
  assert-that > @ 
    app * 9
    $.equal-to
      "9th Fibonacci number is 34"

[MCJOHN974]

@Graur as described here EO has no exceptions, but github actions need non zero return code to failure.