CodeIgniter 4 appstarter beta.2 updated

Re-issued the CI4.0.0-beta.2 appstarter ... the tests folder structure wasn't correct.

If you are using this distribution, and want to make unit tests for your app, you want to check the new release. The "_support" folder moves to "tests/_support".

Thanks for all the hard work, Jim and the CI4 Team!

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(Using CodeIgniter since 1.x)