Display simple coverage summary to console (#7664)
Display simple coverage summary to console (#7664)

This should reduce need for packages like excoveralls in some use cases
when all what is needed is to have total coverage percentage in any
form available for CI to provide coverage badge.

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