So that we can use list sequences, fixes #223

[suhrawardi]

Now we can use list sequences, as proposed in #223

  def user_factory do
    %MyApp.User{
      name: "Jane Smith",
      email: sequence(:email, &"email-#{&1}@example.com"),
      role: sequence(:role, ["admin", "user", "other"]),
    }
  end

[paulcsmith]

Thanks so much for the PR! Could you add some docs to https://github.com/thoughtbot/ex_machina/blob/master/lib/ex_machina.ex#L127 as well? I think it's more likely that people will look there.

[suhrawardi]

@paulcsmith, sure, added it!
Must have overlooked that one... :-)

[germsvel]

Thanks for this PR @suhrawardi!