php qol Sam asked for (#44)

Co-authored-by: Itamar Levy-Or <[email protected]>

src/AWS/CRT/Internal/Encoding.php

@@ -29,6 +29,9 @@ final class Encoding {
     }
 
     public static function encodeString($str) {
+        if (is_array($str)) {
+            $str = $str[0];
+        }
         return pack("Na*", strlen($str), $str);
     }
 }