[FSSDK-8940] Prepare for release 3.9.4 (#266)

* Bump minor version and update change logs

* Update copyright

Author: rafinutshaw-optimizely

CHANGELOG.md

@@ -1,5 +1,10 @@
 # Optimizely PHP SDK Changelog
 
+## 3.9.4
+March 29 , 2023
+
+* We have made changes to avoid unnecessary deprecation notices and fixed some incorrect return hints. ([#265](https://github.com/optimizely/php-sdk/pull/265)).
+
 ## 3.9.3
 March 13, 2023
 

src/Optimizely/Event/Builder/EventBuilder.php

@@ -1,6 +1,6 @@
 <?php
 /**
- * Copyright 2016-2021, Optimizely
+ * Copyright 2016-2021, 2023, Optimizely
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -39,7 +39,7 @@ class EventBuilder
     /**
      * @const string Version of the Optimizely PHP SDK.
      */
-    const SDK_VERSION = '3.9.3';
+    const SDK_VERSION = '3.9.4';
 
     /**
      * @var string URL to send event to.

tests/EventTests/EventBuilderTest.php

@@ -1,6 +1,6 @@
 <?php
 /**
- * Copyright 2016-2021, Optimizely
+ * Copyright 2016-2021, 2023, Optimizely
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -68,7 +68,7 @@ public function setUp()
                 ]],
                 'revision' => '15',
                 'client_name' => 'php-sdk',
-                'client_version' => '3.9.3',
+                'client_version' => '3.9.4',
                 'anonymize_ip'=> false,
                 'enrich_decisions' => true,
             ];