chore(package): update xss to version 0.3.3
chore(package): update xss to version 0.3.3

https://greenkeeper.io/
Serubin/wekan,nztqa/wekan,wekan/wekan,ddanssaert/wekan,mario-orlicky/wekan,GhassenRjab/wekan,wekan/wekan,johnleeming/wekan,mario-orlicky/wekan,oliver4u/sap-wekan,mario-orlicky/wekan,Serubin/wekan,oliver4u/WEKAN_runpartner,jtickle/wekan,johnleeming/wekan,libreboard/libreboard,oliver4u/sap-wekan,nztqa/wekan,wekan/wekan,ddanssaert/wekan,wekan/wekan,wekan/wekan,nztqa/wekan,GhassenRjab/wekan,GhassenRjab/wekan,johnleeming/wekan,oliver4u/WEKAN_runpartner,libreboard/libreboard,Serubin/wekan,jtickle/wekan,johnleeming/wekan,ddanssaert/wekan,oliver4u/sap-wekan,oliver4u/WEKAN_runpartner,jtickle/wekan