Should use .req.ty when checking type of response

[jonathonmcmurray]

https://github.com/jonathonmcmurray/reQ/blob/master/req.q#L179

:$[(`j in key`)&r[0][`$"Content-Type"]like .h.ty[`json],"*";.j.k;] r[1];

In this line we use .h.ty to check type of response, but we have .req.ty created by reQ which should be used instead (in case of other modules modifying .h.ty etc. e.g. serve from https://github.com/jonathonmcmurray/qutil_packages )