upgrade shiro-core to avoid CVE-2016-4437
upgrade shiro-core to avoid CVE-2016-4437

Signed-off-by: Paulo Lopes <fd077434a7c3095bfe440741787d02f6a7bab07e@mlopes.net>

vert-x3/vertx-auth,nevenr/vertx-auth,nevenr/vertx-auth,nevenr/vertx-auth,vert-x3/vertx-auth