[wiki:sfSwiftPlugin] update package.xml for new version 1.5.1
[wiki:sfSwiftPlugin] update package.xml for new version 1.5.1

git-svn-id: dbc5af2d7906ffbbc00ba50580ae95d2804c0537@6447 ee427ae8-e902-0410-961c-c3ed070cd9f9

Symfony-Plugins/sfSwiftPlugin