deactivate negotationneeded to avoid breaking in Chrome 66
deactivate negotationneeded to avoid breaking in Chrome 66

this broke with Chrome 66 because of
    https://groups.google.com/forum/?utm_medium=email&utm_source=footer#!msg/discuss-webrtc/Qxj38DwiJPU/5eCOPWvwBgAJ
and negotiationneeded being generally weird in Chrome.

peers/peerjs