Fix @test_broken completion test #80
Description
In order to get #77 unstuck, I had to mark a test as broken: https://github.com/mortenpi/RemoteREPL.jl/blob/7bae7d4d38495b6acfbc535c7326cb97f954b40b/test/runtests.jl#L167-L169
I'm not totally sure what is going wrong, but it's probably a relatively easy fix, as the completion seeming works fine for me live in the REPL