Update version_template to include Present (#112)

Author: nmuesch

setup.py

@@ -11,7 +11,7 @@
 # Unless explicitly stated otherwise all files in this repository are licensed
 # under the 3-clause BSD style license (see LICENSE).
 # This product includes software developed at Datadog (https://www.datadoghq.com/).
-# Copyright 2019 Datadog, Inc.
+# Copyright 2020-Present Datadog, Inc.
 
 __version__ = "{version}"
 """