Optimize eslint settings

[arielj]

Using these settings can reduce the time required by eslint to check the project before pushing. On my case it went from 1 minute to less than 4 seconds (if we don't use the --cache option we still have a good benefit -from 1 minute to less than 10 seconds on my system-).

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Use the following Checklist if you have changed something on the Backend or Frontend:

• Tested the feature and it's working on a current and clean install.
• Tested the main App features and they are still working on a current and clean install. (Login, Install, Play, Uninstall, Move games, etc.)
• Created / Updated Tests (If necessary)
• Created / Updated documentation (If necessary)

[flavioislima]

Looks good