refactor: remove custom implementation of Keyword.pop_values/2

It has been present since Elixir 1.10

lib/mix/tasks/protox/generate.ex

@@ -33,7 +33,7 @@ defmodule Mix.Tasks.Protox.Generate do
   def run(args) do
     with {opts, files, []} <- OptionParser.parse(args, strict: @options),
          {:ok, output_path} <- Keyword.fetch(opts, :output_path),
-         {include_paths, opts} = pop_values(opts, :include_path),
+         {include_paths, opts} = Keyword.pop_values(opts, :include_path),
          {multiple_files, opts} = Keyword.pop(opts, :multiple_files, false),
          {:ok, files_content} <-
            generate(files, output_path, multiple_files, include_paths, opts) do
@@ -51,17 +51,6 @@ defmodule Mix.Tasks.Protox.Generate do
     File.write!(file_name, content)
   end
 
-  # Custom implementation as Keyword.pop_values/2 is only available since Elixir 1.10
-  defp pop_values(opts, key) do
-    {values, new_opts} =
-      Enum.reduce(opts, {[], []}, fn
-        {^key, value}, {values, new_opts} -> {[value | values], new_opts}
-        {key, value}, {values, new_opts} -> {values, [{key, value} | new_opts]}
-      end)
-
-    {Enum.reverse(values), Enum.reverse(new_opts)}
-  end
-
   defp generate(files, output_path, multiple_files, include_paths, opts) do
     Protox.Generate.generate_module_code(
       files,