Update revision date

extension.xml

@@ -6,7 +6,7 @@
 	<label><![CDATA[Network Management Extended]]></label>
 	<description><![CDATA[TeemIp extension that provides additional classes for network management]]></description>
 	<version>1.0.0</version>
-	<release_date>2020-xx-yy</release_date>
+	<release_date>2020-12-11</release_date>
 	<version_description><![CDATA[First revision - See wiki at https://wiki.teemip.net/doku.php?id=extensions:teemip-network-mgmt-extended]]></version_description>
 	<itop_version_min>2.7.0</itop_version_min>
 	<status>stable</status>