Fix deprecation warnings for String.strip and Integer.to_char_list.

lib/httparrot.ex

@@ -86,7 +86,7 @@ defmodule HTTParrot do
   def prettify_json(status, headers, body, req) do
     if JSX.is_json? body do
       body = JSX.prettify!(body)
-      headers = List.keystore(headers, "content-length", 0, {"content-length", Integer.to_char_list(String.length(body))})
+      headers = List.keystore(headers, "content-length", 0, {"content-length", Integer.to_charlist(String.length(body))})
       {:ok, req} = :cowboy_req.reply(status, headers, body, req)
       req
     else

lib/httparrot/p_handler.ex

@@ -111,10 +111,10 @@ defmodule HTTParrot.PHandler do
   defp parse_content_disposition_header(header) do
     parts = elem(header, 1)
       |> String.split(";")
-      |> Enum.map(&String.strip/1)
+      |> Enum.map(&String.trim/1)
 
     for part <- parts, into: %{} do
-      case String.split(part, "=") |> Enum.map(&String.strip/1) do
+      case String.split(part, "=") |> Enum.map(&String.trim/1) do
         [type] -> {:type, type}
         [key, value] -> {key, String.replace(value, "\"", "")}
       end