3.0.0-alpha8

fix(shim): remove strict void return types for backward compatibility
test(browser): add tests demonstrating native vs legacy value differences
docs(browser): extensively document native vs legacy value differences
refactor(browser): convert lib/ to wrapper around modern implementation
feat(browser): implement Modern PSR-4 Browser with improved detection
test(browser): add PHPUnit test coverage for legacy Browser class
Fix composer.json for packagist.org
Development mode for Browser-3.0.0alpha5