Import Bitwise module instead of "use Bitwise" (#8)

Author: moogle19

lib/hpax/huffman.ex

@@ -1,7 +1,7 @@
 defmodule HPAX.Huffman do
   @moduledoc false
 
-  use Bitwise
+  import Bitwise, only: [>>>: 2]
 
   # This file is downloaded from the spec directly.
   # http://httpwg.org/specs/rfc7541.html#huffman.code

lib/hpax/types.ex

@@ -1,7 +1,7 @@
 defmodule HPAX.Types do
   @moduledoc false
 
-  use Bitwise
+  import Bitwise, only: [<<<: 2]
 
   alias HPAX.Huffman