Version 3.0.0

This is now a major version update to Flight. Honestly not much has changed, but a few things have:

• 100% Code Coverage for all classes in the framework.
• Minor tweaks to framework to make it easier to unit test.
• Found an error with some View Template paths for Windows users that should be addressed.

For all intents and purposes, this is still the same Flight framework with no major changes just yet. Moving forward, we're looking to keep parity with version 2 to upgrading is trivial.

Version 2.0.3

Merged some long standing pull requests from mikecao/flight with cleanup of types, adding phpunit config for code coverage, phpstan, and fixing a type error that could happen with output buffering.