On further inspection I think this is because I managed to name the package 
repository TravelingSalesmanHeuristics.jl (rather than just 
TravelingSalesmanHeuristics). Indeed I just ran 
Pkg.add("TravelingSalesmanHeuristics") and now have in my .julia/v0.4 both 
TravelingSalesmanHeuristics and TravelingSalesmanHeuristics.jl

When I published v0.0.1 Pkg.publish failed (different error, can't 
remember) and I had to create the pull request manually; presumably I now 
have to do that going forward?

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