Opcode check inaccuracy

[truekenny]

php-wss/src/Components/WSClientTrait.php

Line 132 in 6e02758

$opcode_int = ord($data[0]) & 31; // Bits 4-7

31 is 11111b, to check 4 bits, use the constant 15 (1111b).
This is not so important now, because the algorithm grabs the RSV3 bit, which should now be 0.
https://tools.ietf.org/html/rfc6455#section-5.2