update header to the latest xAPI patch version

Author: xabbuh

CHANGELOG.md

@@ -4,6 +4,9 @@ CHANGELOG
 0.6.0
 -----
 
+* updated the `X-Experience-API-Version` header to default to the latest patch
+  version (`1.0.3`)
+
 * allow `2.x` releases of the `php-xapi/model` package too
 
 0.5.0

src/XApiClientBuilder.php

@@ -183,7 +183,7 @@ public function build()
             $httpClient = new PluginClient($httpClient, $plugins);
         }
 
-        $version = null === $this->version ? '1.0.1' : $this->version;
+        $version = null === $this->version ? '1.0.3' : $this->version;
         $requestHandler = new Handler($httpClient, $this->requestFactory, $this->baseUrl, $version);
 
         return new XApiClient($requestHandler, $serializerRegistry, $this->version);