install.sh: Add error message at the end.
install.sh: Add error message at the end.

License: MIT
Signed-off-by: Stephan Kulla <72a5714643d022e6452f88306b2b4680ded56c77@kulla.me>

kyledrake/go-ipfs,chriscool/go-ipfs,WilliButz/go-ipfs,kyledrake/go-ipfs,JustinDrake/go-ipfs,ipfs-filestore/go-ipfs,JustinDrake/go-ipfs,OpenBazaar/go-ipfs,Quantomicus/go-ipfs,insionng/go-ipfs,chriscool/go-ipfs,MichaelMure/go-ipfs,ianopolous/go-ipfs,llawall/go-ipfs,MichaelMure/go-ipfs,llawall/go-ipfs,MichaelMure/go-ipfs,Luzifer/go-ipfs,WilliButz/go-ipfs,tswindell/go-ipfs,ianopolous/go-ipfs,tswindell/go-ipfs,rht/go-ipfs,ipfs-filestore/go-ipfs,JustinDrake/go-ipfs,Luzifer/go-ipfs,insionng/go-ipfs,Quantomicus/go-ipfs,kyledrake/go-ipfs,Quantomicus/go-ipfs,WilliButz/go-ipfs,tswindell/go-ipfs,OpenBazaar/go-ipfs,Luzifer/go-ipfs,rht/go-ipfs,llawall/go-ipfs,ipfs-filestore/go-ipfs,insionng/go-ipfs,ianopolous/go-ipfs,chriscool/go-ipfs,OpenBazaar/go-ipfs,rht/go-ipfs