use tac instead of -r option as that option is not available in GNU tail

[ccrockett]

Fixes #88 on linux machines

Note: This file may have already been copied to your rails project if you have already done cypress_on_rails:install. Look in spec/cypress/app_commands/ (default path) for the log_fail.rb file

[grantspeelman]

Thanks for this.

i might rather comment this line out for now, or maybe look into doing it with ruby instead or some other way of getting the logs of the current test that will work on all Operating Systems.

[ccrockett]

agree that a pure ruby approach would be more OS agnostic but just to be clear this fix should make it work for those people running RoR in windows subsystem for linux as well