README: Updated references (#2402)
README: Updated references (#2402)

* update ref

* add ref

* add year


Former-commit-id: 849cf69f624b690e2c46363723d331e9a734e88e
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox