Fix race condition on supervisor test
Fix race condition on supervisor test

antipax/elixir,kimshrier/elixir,ggcampinho/elixir,kimshrier/elixir,lexmag/elixir,kelvinst/elixir,pedrosnk/elixir,beedub/elixir,beedub/elixir,gfvcastro/elixir,kelvinst/elixir,ggcampinho/elixir,elixir-lang/elixir,gfvcastro/elixir,michalmuskala/elixir,antipax/elixir,joshprice/elixir,lexmag/elixir,pedrosnk/elixir