Update License Header to 2021.

The-inside-man · The-inside-man · commit 9610564d8371 · 2021-07-15T13:07:59.000-04:00
diff --git a/optimizely/event/user_event_factory.py b/optimizely/event/user_event_factory.py
@@ -1,4 +1,4 @@
-# Copyright 2019 Optimizely
+# Copyright 2019, 2021 Optimizely
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at

Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,4 @@`
`1`		`-# Copyright 2019 Optimizely`
	`1`	`+# Copyright 2019, 2021 Optimizely`
`2`	`2`	`# Licensed under the Apache License, Version 2.0 (the "License");`
`3`	`3`	`# you may not use this file except in compliance with the License.`
`4`	`4`	`# You may obtain a copy of the License at`