Update plugin.xml
Update plugin.xml

Fix the release date
igniterealtime/Openfire,akrherz/Openfire,akrherz/Openfire,GregDThomas/Openfire,speedy01/Openfire,guusdk/Openfire,Gugli/Openfire,GregDThomas/Openfire,Gugli/Openfire,igniterealtime/Openfire,akrherz/Openfire,igniterealtime/Openfire,guusdk/Openfire,akrherz/Openfire,speedy01/Openfire,speedy01/Openfire,GregDThomas/Openfire,speedy01/Openfire,Gugli/Openfire,guusdk/Openfire,igniterealtime/Openfire,GregDThomas/Openfire,speedy01/Openfire,akrherz/Openfire,igniterealtime/Openfire,GregDThomas/Openfire,guusdk/Openfire,guusdk/Openfire,Gugli/Openfire,Gugli/Openfire