Merge pull request #13 from Pymossy/patch-1

Update jDateTime.php

Author: miladr

src/Miladr/Jalali/jDateTime.php

@@ -443,7 +443,7 @@ private static function getMonthNames($month, $shorten = false, $len = 3)
             case '2': $ret = 'اردیبهشت'; break;
             case '3': $ret = 'خرداد'; break;
             case '4': $ret = 'تیر'; break;
-            case '5': $ret = 'امرداد'; break;
+            case '5': $ret = 'مرداد'; break;
             case '6': $ret = 'شهریور'; break;
             case '7': $ret = 'مهر'; break;
             case '8': $ret = 'آبان'; break;