fix grunt issue
fix grunt issue

samdutton/apprtc,webrtc/apprtc,samdutton/apprtc,samdutton/apprtc,webrtc/apprtc,bpyoung92/apprtc,bpyoung92/apprtc,webrtc/apprtc,bpyoung92/apprtc,samdutton/apprtc,bpyoung92/apprtc,webrtc/apprtc,samdutton/apprtc,bpyoung92/apprtc,webrtc/apprtc