Improve number validation in OptionParser
Improve number validation in OptionParser

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