Update jerowork/middleware-request-handler requirement || ^0.5

Update phpunit/phpunit requirement from ^6.5 || ^7.0 to ^6.5 || ^7.0 || ^8.0

Update .travis.yml

Update phpunit/phpunit requirement from ^6.5 to ^6.5 || ^7.0

Update zendframework/zend-diactoros requirement || ^2.0

Added tests

Update composer.json

Updated psr15 packages to psr/ version

Removed not used use statement + not needed class comment

Fix remaining parent middleware to execute aafter all route middleware instead of before

Updated json

Updated readme

Remove old components

Replaced middleware request handler

Update README.md