Trim go paths

[r-darwish]

@jtsagata can you please check this branch?

[MCOfficer]

Files and directories can technically end in whitespace, so there's the extremely unlikely scenario that this will break go updates for users who have their gopath set to, say ~/mygo

Edit: Seems like github strips whitespace as well. Oh well

[jtsagata]

It's working as expected with the trimming.

Now, if my $GOPATH, or any directory, ends with space, I will expect much more Sirius problems than this :-). Maybe just remove a trailing `\n;