fix: close the UdpWriter (#144)

* fix: close the UdpWriter

* docs: updated CHANGELOG.md

* docs: Update CHANGELOG.md

---------

Co-authored-by: Dmytro Sokil <[email protected]>
Co-authored-by: Jakub Bednář <[email protected]>

Author: 3 people

CHANGELOG.md

@@ -1,5 +1,8 @@
 ## 3.4.0 [unreleased]
 
+### Bug Fixes
+1. [#144](https://github.com/influxdata/influxdb-client-php/pull/144): Correcti closing the UdpWriter
+
 ## 3.3.0 [2023-03-29]
 
 ### Others

src/InfluxDB2/UdpWriter.php

@@ -119,6 +119,8 @@ public function close()
     {
         if (isset($this->socket)) {
             socket_close($this->socket);
+
+            $this->socket = null;
         }
     }
 }