Replace fopen/fread with file_get_contents in Scanner class

Fixes #257

Author: ideag

src/Scanner/Scanner.php

@@ -77,15 +77,12 @@ protected function saveTranslation(
      */
     protected static function readFile(string $file): string
     {
-        $length = filesize($file);
+        $content = @file_get_contents($file);
 
-        if (!($fd = fopen($file, 'rb'))) {
+        if (false === $content) {
             throw new Exception("Cannot read the file '$file', probably permissions");
         }
-
-        $content = $length ? fread($fd, $length) : '';
-        fclose($fd);
-
+        
         return $content;
     }
 }