Update installer.py
Update installer.py

Former-commit-id: cbe188d40f213eb44a28d5ec6461869ea719ac4e [formerly 561f8630cd7829e8b6c466156fcf3ca6fa34dffe]
Former-commit-id: 0ecd6004a036d154f65fea98031b6824ff1a8f12
Former-commit-id: 5fa02f738d568c18c663a379ea4d93eba387cfea
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox