[FSSDK-9415] Revert minor release 3.10.0 (#271)

* Update CHANGELOG.md

* Update EventBuilder.php

* Update EventBuilderTest.php

Author: Mat001

CHANGELOG.md

@@ -1,10 +1,5 @@
 # Optimizely PHP SDK Changelog
 
-## 3.10.0
-June 9, 2023
-
-* Provided support for PHP version 8.x (backwards compatible with previous PHP versions).
-
 ## 3.9.4
 March 29 , 2023
 

src/Optimizely/Event/Builder/EventBuilder.php

@@ -39,7 +39,7 @@ class EventBuilder
     /**
      * @const string Version of the Optimizely PHP SDK.
      */
-    const SDK_VERSION = '3.10.0';
+    const SDK_VERSION = '3.9.4';
 
     /**
      * @var string URL to send event to.

tests/EventTests/EventBuilderTest.php

@@ -69,7 +69,7 @@ protected function setUp() : void
                 ]],
                 'revision' => '15',
                 'client_name' => 'php-sdk',
-                'client_version' => '3.10.0',
+                'client_version' => '3.9.4',
                 'anonymize_ip'=> false,
                 'enrich_decisions' => true,
             ];