support for PHPUnit 7.x; drop support for PHPUnit 6.x

Author: DavertMik

.travis.yml

@@ -1,7 +1,6 @@
 language: php
 
 php:
-  - 7.0
   - 7.1
   - 7.2
 

composer.json

@@ -10,9 +10,9 @@
         }
     ],
     "require": {
-        "php": ">=7.0.0",
+        "php": ">=7.1.0",
         "myclabs/deep-copy": "~1.1",
-        "phpunit/phpunit": "^6.0"
+        "phpunit/phpunit": "^7.0"
     },
     "autoload": {
         "psr-0": {

src/Codeception/Specify/ResultPrinter.php

@@ -7,7 +7,7 @@ class ResultPrinter extends \PHPUnit\TextUI\ResultPrinter
     /**
      * @param string $progress
      */
-    protected function writeProgress($progress)
+    protected function writeProgress($progress) : void
     {
         $this->write($progress);
         $this->column++;