Update elixir.bat
Update elixir.bat

Correct issue https://github.com/elixir-lang/elixir/issues/3619

Signed-off-by: José Valim <0c2436ea76ed86e37cc05f66dea18d48ef390882@plataformatec.com.br>

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