drop php 5.6/7.0 support

Author: Gemorroj

.php_cs.dist

@@ -10,9 +10,9 @@ return PhpCsFixer\Config::create()
         'array_syntax' => ['syntax' => 'short'],
         'combine_consecutive_issets' => true,
         'combine_consecutive_unsets' => true,
-        // 'compact_nullable_typehint' => true,
+        'compact_nullable_typehint' => true,
         'linebreak_after_opening_tag' => true,
-        // 'list_syntax' => ['syntax' => 'short'],
+        'list_syntax' => ['syntax' => 'short'],
         // 'mb_str_functions' => true,
         'native_function_invocation' => true,
         'no_null_property_initialization' => true,

.travis.yml

@@ -1,10 +1,9 @@
 language: php
 php:
-    - 5.6
-    - 7.0
     - 7.1
     - 7.2
     - 7.3
+    - 7.4
     - nightly
 
 matrix:

README.md

@@ -19,7 +19,7 @@ print_r($resultCheckFile);
 
 ### Requirements:
 
-- PHP >= 5.6
+- PHP >= 7.1.3
 
 ### Installation:
 ```bash

composer.json

@@ -4,12 +4,12 @@
     "description": "PHP code syntax checker.",
     "license": "LGPL-3.0",
     "require": {
-        "php": ">=5.6",
-        "symfony/process": "^3.3|^4.0"
+        "php": "^7.1.3",
+        "symfony/process": "^4.0|5.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "^5.7",
-        "friendsofphp/php-cs-fixer": "^2.15"
+        "phpunit/phpunit": "^7.5",
+        "friendsofphp/php-cs-fixer": "^2.16"
     },
     "authors": [
         {

phpunit.xml.dist

@@ -1,8 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 
 <phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-         xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/5.7/phpunit.xsd"
-         backupGlobals="false"
+         xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/7.5/phpunit.xsd"
          colors="true"
          bootstrap="vendor/autoload.php"
 >

src/Php.php

@@ -172,7 +172,7 @@ public function checkFile($file)
         \preg_match('/ on line ([0-9]+)$/', $result['output'], $matchLine);
         $line = isset($matchLine[1]) ? \intval($matchLine[1]) : null;
 
-        list($type, $message) = \explode(': ', $fullMessage);
+        [$type, $message] = \explode(': ', $fullMessage);
 
         return [
             'validity' => false,

tests/PhpTest.php

@@ -1,9 +1,10 @@
 <?php
 namespace Syntax\Tests;
 
+use PHPUnit\Framework\TestCase;
 use Syntax\Php;
 
-class PhpTest extends \PHPUnit_Framework_TestCase
+class PhpTest extends TestCase
 {
     /**
      * @var Php