Support PHPUnit 9 (#50)

* Support PHPUnit 9

* Run tests on PHP 7.3 and 7.4

* Made ResultPrinter compatible with PHPUnit 9

Author: Naktibalda

.travis.yml

@@ -3,6 +3,8 @@ language: php
 php:
   - 7.1
   - 7.2
+  - 7.3
+  - 7.4
 
 before_script:
   - composer update

composer.json

@@ -12,7 +12,7 @@
     "require": {
         "php": ">=7.1.0",
         "myclabs/deep-copy": "~1.1",
-        "phpunit/phpunit": ">=7.0 <9.0"
+        "phpunit/phpunit": ">=7.0 <10.0"
     },
     "autoload": {
         "psr-0": {

src/Codeception/Specify/ResultPrinter.php

@@ -2,7 +2,13 @@
 
 namespace Codeception\Specify;
 
-class ResultPrinter extends \PHPUnit\TextUI\ResultPrinter
+use PHPUnit\TextUI\DefaultResultPrinter;
+
+if (!class_exists(DefaultResultPrinter::class)) {
+    class_alias(\PHPUnit\TextUI\ResultPrinter::class, DefaultResultPrinter::class);
+}
+
+class ResultPrinter extends DefaultResultPrinter
 {
     /**
      * @param string $progress