Upgrade to Struts2 version 2.3.20
Upgrade to Struts2 version 2.3.20

abhijeet90/abhi,perfnorm/struts2-bootstrap,struts-community-plugins/struts2-bootstrap,struts-community-plugins/struts2-bootstrap,abhijeet90/abhi,perfnorm/struts2-bootstrap,struts-community-plugins/struts2-bootstrap