fix: use :erlang.bxor/2 instead of Bitwise.bxor/2 (#18)

* use :erlang.bxor/2 instead of Bitwise.bxor/2

* add change notes to changelog

Author: the-mikedavis

CHANGELOG.md

@@ -6,6 +6,13 @@ The format is based on [Keep a
 Changelog](https://keepachangelog.com/en/1.0.0/), and this project adheres to
 [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## 0.1.2 - 2021-07-02
+
+### Fixed
+
+- Switch from using `Bitwise.bxor/2` to `:erlang.bxor/2` for compatibility
+  with Elixir < 1.10
+
 ## 0.1.1 - 2021-07-01
 
 ### Fixed

lib/mint/web_socket/frame.ex

@@ -156,7 +156,7 @@ defmodule Mint.WebSocket.Frame do
       apply_mask(
         payload_rest,
         mask,
-        <<acc::binary, Bitwise.bxor(mask_key, part_key)::integer-size(8)-unit(unquote(n))>>
+        <<acc::binary, :erlang.bxor(mask_key, part_key)::integer-size(8)-unit(unquote(n))>>
       )
     end
   end

lib/mint/web_socket/per_message_deflate.ex

@@ -90,7 +90,7 @@ defmodule Mint.WebSocket.PerMessageDeflate do
 
       frame =
         Frame.unquote(opcode)(frame,
-          reserved: <<Bitwise.bxor(reserved, 0b100)::size(3)>>,
+          reserved: <<:erlang.bxor(reserved, 0b100)::size(3)>>,
           data: data
         )