Added the mailing lists in the README page
Added the mailing lists in the README page


Former-commit-id: 1a1d5e98319a3ab99d9894d5567caf5ed14888df [formerly 0caa76dd988372c6779f6771a2d836a19c99edc4]
Former-commit-id: d5ca2c27161ed4ccdb1a43b11f24d8d4ea573552
Former-commit-id: 0ded5eaf5773f16f166533eea089b92c27856303
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox