Released version 2.4.0

• requires PHP 7.2
• TestCase: added method skip() for skipping tests [Closes #379]
• DataProvider::load() may return empty data set (BC break)
• TestHandler: initiateTestCase() caching (#378)
• TestCase: list all possible TestCase class dependencies (#378)
• TestCase: list methods in format 'Method:testName' (#378)
• CliTester: option --log replaced by -o log (#329)
• CliTester: option -o is repeatable and accepts file name parameter (#329)
• CommandLine: added NORMALIZER (#329)
• Test: measure run time duration (#426)
• Asssert: add hasKey and hasNotKey assertions (#427)
• code coverage: improved coverage report template (#422)