Fixing PHPStan, adding tests on PHP 7.4

Author: moufmouf

.travis.yml

@@ -2,8 +2,7 @@ language: php
 sudo: false
 php:
   - 7.1
-  - 7.2
-  - 7.3
+  - 7.4
 env:
   global:
   # We need to prefer source to get PHPStan test directory. Otherwise, it is removed from ZIP

src/Rules/UseSafeClassesRule.php

@@ -17,6 +17,8 @@
 
 /**
  * This rule checks that no "unsafe" classes are instantiated in code.
+ *
+ * @implements Rule<Node\Expr\New_>
  */
 class UseSafeClassesRule implements Rule
 {

src/Utils/ClassListLoader.php

@@ -9,13 +9,16 @@
 
 class ClassListLoader
 {
+    /**
+     * @var array<class-string,class-string>
+     */
     private static $classes = [
         'DateTime' => 'DateTime',
         'DateTimeImmutable' => 'DateTimeImmutable',
     ];
 
     /**
-     * @return string[]
+     * @return class-string[]
      */
     public static function getClassList(): array
     {