Take watch dirs as an argument

lib/pandoc.ex

@@ -3,7 +3,7 @@ defmodule Pandoc do
   Documentation for `Pandoc`.
   """
 
-  def run(profile, ["--watch"]) do
+  def run(profile, ["--watch" | dirs]) do
     IO.puts("""
 
     Pandoc watcher starting, env: #{Application.get_env(:pandoc, profile) |> inspect(pretty: true)}
@@ -12,7 +12,7 @@ defmodule Pandoc do
     ref =
       __MODULE__.Supervisor
       |> Supervisor.start_child(
-        Supervisor.child_spec({Pandoc.Watcher, [profile, dirs: ["documents"]]},
+        Supervisor.child_spec({Pandoc.Watcher, [profile, dirs: dirs]},
           restart: :transient,
           id: __MODULE__.Watcher
         )