added simple quoted string support

src/Utils/Business/LuDocParser.php

                         $constraint->setMethod($methodName);
                         $args = [];
                         $argMatches = [];
-                        if (preg_match_all('/ *(-?(?:\d*\.\d+|\d+|true|false|"[^"]*"))/', $line, $argMatches) !== false) {
+                        if (preg_match_all('/ *(-?(?:\d*\.\d+|\d+|true|false|"[^"]*"|\'[^\']*\'))/', $line, $argMatches) !== false) {
                             $args = $argMatches[1];
                             foreach ($args as $key => $arg) {
-                                if ($arg[0] == '"') {
+                                if ($arg[0] == '"' || $arg[0] == "'") {
                                     $args[$key] = substr($arg, 1, count($arg) - 2);
                                 }
                             }

tests/LuDocParserTest.php

      * @min 42
      * @max 42
      * @between 0 42
-     * @another 1 2 42.42 true false "a string"
+     * @another 1 2 42.42 true false "a string" \'string\'
      * and another
      * @return AnotherType
      */');
                     ["Method" => "min", "Arguments" => ["42"]],
                     ["Method" => "max", "Arguments" => ["42"]],
                     ["Method" => "between", "Arguments" => ["0", "42"]],
-                    ["Method" => "another", "Arguments" => ["1", "2", "42.42", "true", "false", "a string"]]
+                    ["Method" => "another", "Arguments" => ["1", "2", "42.42", "true", "false", "a string", "string"]]
                 ]
             ]
         ];