Updated DEFAULT_PROTOCOL to 3.

> Protocol version 3 was added in Python 3.0. It has explicit support for bytes objects and cannot be unpickled by Python 2.x. This was the default protocol in Python 3.0–3.7.
gintas · Jun 5, 2020 · a52948e · a52948e
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diff --git a/README.rst b/README.rst
@@ -166,6 +166,8 @@ UNRELEASED
 ==========
 
 * Dropped support for Python 2.
+* Updated default pickle protocol to version 3.
+
 Changes in version 2.1.0
 ========================
 

diff --git a/picklefield/constants.py b/picklefield/constants.py
@@ -1,3 +1,3 @@
 from __future__ import unicode_literals
 
-DEFAULT_PROTOCOL = 2
+DEFAULT_PROTOCOL = 3