* Bump required PHP version to 7.2
* Update rest dependencies to meet php 7.2
Latest phpunit 9 requires PHP 7.3, so I've set phpunit 8 as a fallback.
* Fix TestCase inheritance
* Add phpunit cache file to gitignore
* Put license @phpdoc into separate mustache
* Bump readme PHP version to 7.2
* Bump @phpdoc PHP version to 7.2
* Update Zend Diactoros with suggested package
* Refresh samples
* Remove broken tests
These tests will be fixed in next PR which moves Mock feature to
external repo.
* Point root Travis CI environment to PHP 7.3
* [Slim4] Add new method to Mocker interface
* [Slim4] Add implementation and tests for new method
* [Slim4] Add test fixture to encrease code coverage
* [Slim4] Add ref support to mockArray method
* [Slim4] Add mockFromRef method
* [Slim4] Add ref support to mockObject method
* [Slim4] Add ModelInterface
* [Slim4] Refresh samples
* [Slim4] Add ref support to mockFromSchema method
* [Slim4] Run all test suites by default test command
As it turnes out to generate coverage report for a whole project I need
to run all test suites at once.
* [Slim4] Fix enum option of string mocking
