Ensure CLI results for rolling dice are printed as integers

`IO.inspect` by default treats lists of integers as `charlists`. This
means certain integer combinations result in the list being printed as
`charlist`. This was rather confusing, as getting `~c"\a\n"` when
rolling `2d10` doesn't make much sense (`~c"\a\n"` == `[7, 10]`). To
force `IO.inspect` to read the list as a list of integers, we had to
pass `charlists: :as_lists` in the opts of the function.

lib/cli.ex

@@ -148,7 +148,9 @@ defmodule ExTTRPGDev.CLI do
   def handle_roll(%Optimus.ParseResult{args: %{dice: dice}}) do
     dice
     |> Dice.multi_roll!()
-    |> Enum.each(fn {dice_spec, results} -> IO.inspect(results, label: dice_spec) end)
+    |> Enum.each(fn {dice_spec, results} ->
+      IO.inspect(results, label: dice_spec, charlists: :as_lists)
+    end)
   end
 
   def handle_system_subcommands([command | subcommands], %Optimus.ParseResult{