make README point to real v2 API spec
make README point to real v2 API spec

bug 1052222

Change-Id: I0ecbcd71b25e6c7f514cc2f7e8cb071b75d53059

FreescaleSemiconductor/quantum,FreescaleSemiconductor/quantum,FreescaleSemiconductor/quantum,FreescaleSemiconductor/quantum